3.1 Module 3 Mitigation Options a.General considerations b.Industry c.Buildings d.Transport e.Energy...

3.1

Module 3Mitigation Options

a. General considerationsb. Industryc. Buildings d. Transporte. Energy supplyf. Solid waste and wastewaterg. Land-use, land-use change and forestryh. Agriculture

Note: geological sequestration is not covered but is a potential longer-term mitigation option.

3.2

Module 3a

General Considerations

3.3

Technology Innovations Needed

to Mitigate CO2 Emissions • More efficient technologies for energy

conversion and utilization in all end-use sectors (transportation, industry, buildings, agriculture; power generation)

• New or improved technologies for utilizing alternative energy sources with lower or no GHG emissions (such as natural gas and renewables)

• Technologies for CO2 capture and storage (for large-scale industrial processes like electric power generation and fuels production)

3.4

Technology Policies Have Reduced the

Cost of GHG-Friendly Energy Systems

20000

10000

5000

1000

10010 100 1000 10000 100000

1982

1987

1963

1980

Windmills (USA)

RD&D Commercialization

USAJapan

Cumulative MW installed

19811983

500

Photovoltaics

Gas turbines (USA)

US

(199

0)$

/kW

1995

1992

200

2000

Source: Nakicenovic, 1996

3.5

Facilitating Energy Efficiency

• Almost all countries exhibit declining energy intensity trends for the economic sectors; most countries have some initiatives to promote energy efficiency in these sectors

• Technology integration, support, and financing risks are high

• Adoption is driven by quality and productivity increases

• New investments in power, industry, transport and building infrastructure can be substantially more efficient than existing stock; economic growth is powering a rapid increase in these sectors, and associated emissions.

Picture: Courtesy of Emerson Process Management

3.6

Module 3b

Industry

3.7

Industry: Primary Energy Demand by Region

• Since 1980, industrial energy demand has stagnated in industrialized countries, but continues to grow rapidly in many developing countries, especially in Asia.

Source: IPCC, WGIII, 2002

3.8

Industry: Emissions Contribution

• Globally, 50% of industry energy consumption made up by– Iron & steel– Chemicals– Petroleum refining– Pulp & paper– Cement– Huge variations between countries– Small industries important in many developing

countries.

3.9

Industry

• Unique opportunities for reducing GHGs because process change with energy efficiency benefits often driven by economic and organizational considerations.

• Shortage of capital is a problem in many cases, but gradual improvement in efficiency is likely as investment takes place and new plants are built.

• Nature of industrial decision-making implies that energy-cost savings may either be dominant or secondary in specific technical actions.

• Potential for large efficiency gains due to rapid stock turnover expected in developing countries.

3.10

Industry: Energy Intensity in Pulp and Paper

Industry• Energy intensity

(energy use per unit of value added) has been reducing over the past two decades in many industries, including iron and steel and pulp and paper.

Source: IPCC, WGIII, 2002

3.11

Industry: Technical Options

• Nature of decision-making in industry demands two classes of options:– Those for which energy cost savings are the

dominant decision making criteria --“energy-cost-sensitive”

– Those for which broader criteria such as overall production cost and product quality are more important – “non energy-cost-sensitive”

3.12

Industry: Energy-cost-sensitive options

• Measures for existing processes:– Housekeeping, equipment maintenance, and energy accounting– Energy management systems– Motor drive system improvements– Improved steam production and management– Industrial cogeneration– Heat recovery– Correct dimensioning of motors and mechanical equipment

• Adoption of efficient electric motors, pumps, fans, compressors, and boilers.

• Fuel switching

3.13

• Major process modifications, for example:– improvements to electric arc furnaces and revamping

open-hearth furnaces (steel)– installing improved aluminum smelters, improved

ethylene cracking, and conversion from semi-dry to dry process or installation of pre-calcination (cement)

– Use of non-carbonated materials for cement clinker production & additives to reduce clinker production.

• Installation of new production capacity• More efficient use of materials

Industry: Non Energy-cost-sensitive Options

3.14

Industry: Non CO2 Greenhouse Gases

• Nitrous Oxide Emissions from Industrial Processes

• PFC Emissions from Aluminium Production • PFCs and Other Substances Used in

Semiconductor Production • HFC-23 Emissions from HCFC-22 Production • Emissions of SF6 from the Production, Use and

Decommissioning of Gas Insulated Switchgear • Emissions of SF6 from Magnesium Production

and Casting

3.15

Industry: Mitigation Measures

• Research, development, and commercial demonstration of new technologies and processes

• Tax incentives for energy efficiency, fuel switching, and reduction in GHG emissions

• Removal of market barriers• Government procurement programs• Emission and efficiency standards• Voluntary agreements

3.16

Module 3c

Buildings (Residential and Commercial Sector)

3.17

Buildings: Primary Energy Growth by Sector

• Space heating is the dominant energy end-use in temperate areas, space-cooling is more important in tropical areas.

• Developed countries account for the vast majority of buildings-related CO2 emissions, but the bulk of the growth in the past two decades was in developing countries.

3.18

Buildings: Technical Options

• Building Equipment– energy efficient space and heating (heat

pumps, CHP)– efficient lighting, air conditioners,

refrigerators, and motors– efficient cook stoves, household

appliances, and electrical equipment– efficient building energy management and

maintenance• Building Thermal Integrity

– improved insulation and sealing– energy-efficient windows– proper building orientation

• Using Solar Energy– active and passive heating and cooling;

climate-sensitive design– effective use of natural light (“daylighting”)

Picture: NREL

3.19

Buildings: Mitigation Measures

• Information programs– Labelling– Demonstration projects

• Market based programs– incentives to consumers for new energy-efficient products (in many

situations, the fate of less efficient second-hand equipment must be considered).

– energy service companies– energy-efficient product development incentives for manufacturers– government or large-customer procurement for energy-efficient products – voluntary initiatives by industry

• Regulatory measures– mandated energy-efficiency performance standards, increasingly stringent

over time– mandated appliance efficiency standards and efficiency labeling

3.20

Module 3d

Transport

3.21

Transport: Projected GHG Emissions by

Mode

Source: IEA, World Energy Outlook, 2002

3.22

Background.

• The transport sector is perhaps the biggest challenge for GHG mitigation.

• GHG emissions from the Transport sector are growing more rapidly than any other sector.

• Developing country transport emissions are growing faster than in other regions of the world.

• Technical and fuel switching solutions for GHG mitigation are particularly challenging in the transport sector.

3.23

Transport: Technical Options

• Fuel Efficiency Improvements for Vehicles– Changes in vehicle and engine design (e.g. hybrids)

• Alternative Fuel Sources– hydrogen or electricity from renewable power– biomass fuels, CNG, LPG, etc.– fuel cell technology

• Infrastructure and System Changes– traffic and fleet management systems– mass transportation systems and improved land-use planning.– modal shifts

• Transport Demand Management– Reducing travel demand (e.g. through land use changes,

telecommunications, etc.)

3.24

Transport: Mitigation Measures

• Market-based Instruments– increase in fuel tax – incentives for mass transport systems – fiscal incentives and subsides for alternative fuels and

vehicles– incentives through vehicle taxes and license fees for more

efficient vehicles

• Regulatory Instruments– fuel economy standards – vehicle design or alternative fuel mandates

• Direct Investment by Governments

3.25

Transport: Starting Questions for Analysis

• Overall: how can societal preferences be matched with transport options to lower GHG emissions?

• Demand forecasting: how much travel or freight movement is expected?• Mode choice: what mix of transport modes will be used to provide

passenger and freight services?• Vehicle stock analysis: what is the impact of changing technology (fuel

economy, fuel type, emission controls) on fuel use and emissions?• Logistics management: how can activities be reorganized to reduce

transport use?• Transport management: how should infrastructure and vehicle flow be

managed to reduce congestion or improve efficiency?• Transport planning: what investments are needed to meet growing

demand and improve efficiency?

Emissions per Passenger-Km by Mode in Developing

Countries

Source: Pew Center, 2002

3.27

Module 3e

Energy Supply

3.28

Energy Supply: Conventional

• The conventional energy supply system consists of the following sectors:– Oil– Gas– Coal– Nuclear materials– Electric power– Biomass

• While the electric power sector is often the largest contributor to GHG emissions, all elements of the fuel cycle need to be considered when assessing the mitigation potential in this sector.

3.29

Energy Supply: Fuel Cycle Emissions from Oil Sector

Sector/Fuel Source of

Cycle Stage Emissions CO2 CH4 CO NOx

Oil Sector

Production Gas Flaring x x

Transport Spills x

Refining Distillation x x x x

Fractionation

Spills

Storage Leaks

Combustion

3.30

Energy Supply: Fuel Cycle Emissions from Gas and Coal

SectorsSector/Fuel Source of

Cycle Stage Emissions CO2 CH4 CO NOx

Gas Sector

Production Gas Flaring x

Transport Pipeline Leaks x

Liquefaction/ Regasification Leaks x

Coal Sector

MiningCoal bed methane x

Transport

Cleaning x x x

3.31

Energy Supply: Fuel Cycle Emissions from Nuclear Materials

and Electric Power SectorsSector/Fuel Source of

Cycle Stage Emissions CO2 CH4 CO NOx

Nuclear Materials Sector

Mining X

Processing X X X X

Electric Power Sector

Generation FuelCombustion X X X X

Hydro Power Inundation X X

3.32

Energy Supply Sector: Technical Options

• Advanced conversion technologies– advanced pulverized coal combustion– fluidized bed combustion (atmospheric and

pressurized)– coal gasification and combined cycle technology– combined heat and power systems – cogeneration– fuel cells/hydrogen– Synthetic fuels from fossil resources w/CO2

sequestration in situ.• Switching to lower carbon fossil fuels and renewable

energy– hydropower– wind energy – biomass – geothermal – photovoltaics (PV)– solar thermal

• Power station rehabilitation• Reduction of losses in transmission and distribution

of electricity and fuels• Improved fuel production and transport

– recovery of coal mine methane – coal beneficiation and refining– improved gas and oil flaring

Picture: NREL

3.33

Energy Supply Sector: Mitigation Measures

• Pure market-based instruments– GHG and energy taxes and subsidies– full social cost pricing of energy services

• Strict command-and-control regulation– specifying the use of specific fuels– performance and emission standards

• Hybrid measures– tradable emission permits – (renewable) portfolio standards, with tradable credits

• Voluntary agreements and actions by industry

• Research, development, and demonstration activities

• Removal of institutional barriers

3.34

Energy Supply: Technological and Efficiency Improvements in Power

Supply Sector• Large efficiency gains

can be achieved by replacing the separate production of heat and power with combined heat and power (CHP) technologies.

3.35

Energy Supply: Renewable Energy Technologies

• Solar– Photovoltaics - Flat Plate – Photovoltaics - Concentrator– Solar Thermal Parabolic

Trough– Solar Thermal Dish/Stirling– Solar Thermal Central

Receiver– Solar Ponds

• Hydropower – Conventional– Pumped Storage– Micro-hydro

• Ocean– Tidal Energy– Thermal Energy Conversion

• Wind– Horizontal Axis Turbine– Vertical Axis Turbine

• Biomass– Direct Combustion – Gasification/Pyrolysis – Anaerobic Digestion

• Geothermal– Dry Steam– Flash Steam– Binary Cycle– Heat Pump– Direct Use

3.36

Energy Supply: Solar Photovoltaics

• Solar panels using silicon PV conversion have efficiencies in excess of 15 percent, and thin film modules are typically 10 percent.

• PV panels are available in sizes from a few watts to 300 watts and produce DC electricity in the range of 12 to 60 volts, and can be used for applications such as:– charging electric lanterns and laptop computers (4 - 6 watts);– packaged systems (20 - 100+ watts) for off-grid residential lighting and

entertainment (radio/ cassette, TV/VCR); and– grid-connected power (hundreds of kilowatts to a megawatt or more).

• Current costs make solar PVs prohibitive in most situations.• Can be attractive in niche applications, especially for off-grid

electrification.• Good prospects for further increases in efficiency and reductions in

costs.

3.37

Energy Supply: Changes in Wind Electricity Generation Costs in

Denmark• Wind power accounts for

0.3% of global installed generation capacity.

• It has increased by an average of 25% annually in recent years.

• The cost of wind has fallen dramatically, following a classic learning curve.

3.38

Energy Supply: Biomass

• For mitigation, focus should be on renewable biomass, which has no net CO2 emissions.

• Modern conversion of biomass into electricity, liquid and gaseous fuels shows great promise.

• In addition, co-firing 10-15% biomass with coal can reduce GHG emissions

In developing countries, biomass is a major source of energy services for the poor.

Source: IEA

3.39

Cost/u

nit p

roduce

d o

r saved (

$./kW

h)

Electricity Output (GWh/year)

Effic

.

Moto

rs

CF

Ls

Impro

ved

pum

psets

Total ResourceRequirement

Sm

all H

ydro

Win

d

Natu

ral G

as

Nucle

ar

Sola

r P

V

Cogenera

tion

Coal

Energy Supply: Typical Least Cost-Supply Staircase

3.40

Module 3f

Solid Waste and Wastewater

3.41

Solid Waste and Wastewater: Introduction

• Methane (CH4) is emitted during the anaerobic decomposition of the organic content of solid waste and wastewater.

• There are large uncertainties in emissions estimates, due to the lack of information about the waste management practices employed in different countries, the portion of organic wastes that decompose anaerobically and the extent to which these wastes will ultimately decompose.

• About 20–40 Mt CH4 (110–230 Mt C), or about 10% of global CH4 emissions from human-related sources, are emitted from landfills and open dumps annually.

• Another 30-40 Mt CH4 (170–230 Mt C) annual emissions are from domestic and industrial wastewater disposal.

• It is important to remember that the Materials life-cycle has both energy and non-energy related emissions.

3.42

Solid Waste: GHG Sources and Sinks associated with Materials Life-Cycle

Source: U.S. EPA

3.43

Technical Options

• Source Reduction– Recycling– Composting– Incineration (including off-set for

electricity generation)– Avoidance/waste prevention

• Methane Recovery from Solid-waste Disposal– Solid waste disposal facilities (including

off-sets for electricity generation and co-generation; gas recovery)

• Methane Recovery and/or Reduction from Wastewater– Wastewater treatment plants (including

off-sets for electricity generation and co-generation; gas recovery)

Landfill Gas Recovery.Picture: University of Tennessee

3.44

Measures

• Regulatory standards for waste disposal and wastewater management

• Provision of market incentives for improved waste management and recovery of methane

• Voluntary program to encourage adoption of technical options

3.45

Barriers to Methane Recovery

• Lack of Information: Lack of awareness of relative costs and effectiveness of alternative technical options, lack of experience with low-cost recently developed anaerobic processes

• Economics: Equipment and infrastructure may not be readily affordable.

• State of Current Landfills: Existing waste disposal "system" may actually be an open dump or an effluent stream with no treatment and no capital or operating expenses. It is less economical to recover CH4 from smaller dumps and landfills.

• Conflicting Interests: Different agencies may be responsible for energy generation, compost supply, and waste management. CH4 recovery and use can introduce new actors into the waste disposal process, potentially disturbing the current balance of economic and political power in the community.

3.46

Module 3g

LULUCF: Land-use, land-use change and forestry

3.47

Key LULUCF Sectors

1. Forestry2. Rangelands and Grasslands 3. Agriculture

3.48

Role of LULUCF Sectors in Global GHG Emissions

Global Emissions per year (early 1990's)

Fossil fuels Landuse sectors

Carbon Emissions (GtC) 6.0 +- 0.5 1.6 +- 0.4

Methane (Tg) 100 400

Other GHG (Anthropogenic) Significant but < 5 %

Net Sequestration (GtC) 0 0.7 +- 0.2

Climate change impacts (2*CO2)

Projections show an increase of forest area from 8 - 13 % of the current 82.7 Mi km2, and mixed impacts on drylands and agricultural areas in different regions of the world

3.49

Key Steps in LULUCF Mitigation Assessment

a) Identification and categorization of the mitigation options appropriate for carbon sequestration.

b) Assessment of the current and future land area available for mitigation options.

c) Assessment of the current and future demand for products and for land.

d) Determination of the land area and product scenarios by mitigation option.

e) Estimation of the C-sequestration per ha. for major available land classes, by mitigation option.

f) Estimation of unit costs and benefits.

g) Evaluation of cost-effectiveness indicators.

h) Development of future carbon sequestration and cost scenarios.

i) Exploration of policies, institutional arrangements and incentives necessary for the implementation of mitigation options.

j) Estimation of the national macro-economic effects of these scenarios.

3.50

Potential Area Available for Mitigation in Select Countries

(million ha)

3.51

Forestry Mitigation Options

1. Reducing GHG emissions through:– conservation and protection– efficiency improvements– fossil fuel substitution

2. Sequestering carbon through:– Increased forest area– increased vegetation cover– increased carbon storage in soils– conversion of biomass to long-term products

3.52

Drylands Mitigation Options

Rangelands and Grasslands:1. Reduction of Emissions

• Improved range and fire management• Improved animal husbandry • Biomass replenishment

2. Carbon Sequestration:• Biomass replenishment• Enhanced soil carbon storage

3.53

Module 3h

Agriculture

3.54

Agriculture Mitigation Options

1. Emission Reduction through improved:– Rice cultivation– Animal husbandry– Fertilizer application– Cultivation methods

2. Carbon Sequestration through:– Agro-forestry– Agricultural tree crops– Soil carbon storage– “No till” cropping

3.55

Agricultural Sector Mitigation Assessment

• Included Gases and Activities

• CH4 from Livestock

• Enteric Fermentation (digestive)

• Manure Management

• CH4 from Rice Cultivation

• N2O from Disturbance of Agricultural Soils

Note: Open Biomass burning of agricultural waste is covered under Land-use Change and Forestry

3.56

Main Sources of Emissions from Agriculture

CH4 Emissions from Livestock and Manure

1. Enteric Fermentation– CH4 emitted from normal digestive processes– Main source: mostly ruminant animals, e.g. cattle

and sheep, & non-ruminants e.g. horses and pigs– Main factors influencing emissions:

a. type of digestive system

b. age

c. weight

d. quality and

e. quantity of feed intake

3.57

Main Sources of Emissions from Agriculture

CH4 Emissions from Livestock and Manure

2. Manure from livestock– CH4 is emitted from anaerobic

decomposition of organic matter, mostly slurry/liquid manure

– Main factors are:a. manure management system

b. temperature

c. quantity of manure produced

3.58

Baseline Emissions from AgricultureCH4 Emissions from Livestock and Manure

Proposed approach• Identify the target animal types for mitigation • Estimate animal population by animal types• Select emission factor per head for each animal

type– Tier 1 countries: Select from standard default values

– Tier 2 countries: Develop emission factors based on country specific conditions

• Multiply animal population by emission factor to obtain baseline emission levels

3.59

Baseline Emissions from AgricultureCH4 Emissions from Livestock and

Manure

Cattle categories:• Dairy cattle: Milk producing cows for

commercial exchange and calves as well as heifers being kept for future diary production

• Non-dairy cattle: All non-diary cattle, including cattle for beef production, draft and breeding animals

3.60

Baseline Emissions from AgricultureCH4 Emissions Factors for Enteric

Fermentation

3.61

Baseline Emissions from AgricultureCH4 Emission Factors for Manure

Management

3.62

Baseline Emissions from AgricultureCH4 Emission Factors for Manure

ManagementAnimal

Cool

DC’s Temp

Warm

Cool

LDC’s Temp

Warm

Sheep 0.19 0.28 0.37 0.10 0.16 0.21

Goats 0.12 0.18 0.23 0.11 0.17 0.22

Camels 1.59 2.38 3.17 1.28 1.92 2.56

Horses 1.39 2.08 2.77 1.09 1.64 2.18

Mules/Asses 0.76 1.14 1.51 0.60 0.90 1.19

Poultry 0.078 0.117 0.157 0.012 0.018 0.023

* In Kg CH4/head/year, Cool<150, 150<Temperate<250, Warm>250

3.63

Emissions from AgricultureCH4 Emissions from Livestock and

Manure

• Tier 1 Method– Perform for each animal type for each climatic

region if applicable

– Annual Emissions =Pop*[EFenteric +EFmanure]– Note: The term Tier 2 applies to those countries with

large numbers of livestock with substantial contribution to national emissions.

3.64

Emissions from AgricultureCH4 Emissions from Livestock and

Manure

• Tier 2 Recommended Method:– Detailed animal types– Detailed animal and feed characteristics– Estimate feed intake– Detailed manure management data and

country specific emission factors

3.65

Emissions from AgricultureCH4 Emissions from Livestock and

ManureRecommended representative cattle types for Tier 2

3.66

Baseline Emissions from AgricultureCH4 Emissions from Livestock and

Manure• Tier 2 Method for Enteric Fermentation

(by animal type)

– Emissions (kg CH4/yr) =(GE * Ym * 365 days/yr)/(55.65 MJ/kg CH4)

– where:• GE = daily gross energy intake (MJ/day)• Ym = methane conversion rate (default = 0.06)

– GE = [(NEm + NEf + NEl + NEd + NEp)/(NE/DE) + (NEg/(NEg/DE)] * (100/DE%)

– where:• NE = Net Energy DE = Digestive Energy

3.67

Baseline Emissions from AgricultureCH4 Emissions from Livestock and

Manure• Tier 2 Method for Manure Management

(by animal type)

– Emissions (kg CH4/yr) = VS * 365 days/yr * B0 *0.67 kg CH4/m3 * jk(MCFjk) * MS%jk)

Where:

– VS = daily volatile solids excreted (kg/day)

– B0 = maximum methane producing capacity for manure (m3 CH4/kg VS)

– MCF = methane conversion factor

– MS% fraction of animal type’s manure handled

– jk = manure management system j in climate k

3.68

Baseline Emissions from AgricultureCH4 Emissions from Flooded Rice Fields

Overview

- Decomposition of organic material in flooded rice fields produces CH4.

- CH4 escapes to the atmosphere primarily by diffusive transport through rice plants.

- Flux rates are highly variable, both spatially and temporally -- depending on water management, soil temperature, soil type and cultivation practices.

- The method is revised in the Revised 1996 IPCC Guidelines

3.69

Emissions from AgricultureCH4 Emissions from Flooded Rice Fields

Definitions

- Growing season length: The average (for the country or subcategory) length of time in days, from seeding or transplanting until harvest

- Continuously flooded: Fields inundated for the duration of the growing season

- Intermittently flooded: Inundated part of the time

- Dry (upland): Fields seldom flooded during the growing season

- Harvested area: Accounts for multiple cropping per year; harvested area=>cultivated area.

3.70

Estimating Emissions from AgricultureCH4 Emissions from Flooded Rice Fields

Apply to each water management regime

Emissions (Gg CH4) = Harvested Area (Mha/yr)

x Growing season length (days)

x Emission Factor (kg Ch4/ha/day)

Emission factors: depend on water management and average growing season temperature

3.71

Emissions from AgricultureCH4 Emissions from Flooded Rice Fields

CH4 Emissions =i Harvested Area x SFi x CFi x EFi

Where:

SFi = scaling factor for each water management system i.

CFi = Correction factor for organic amendments applied in each water management system i.

EF = Seasonally integrated emission factor for continuously flooded rice without organic amendments

3.72

Emissions from AgricultureEmissions from Agricultural Soils

Overview:• Agricultural soils may emit or sequester N2O, CO2

and CH4

• Fluxes are affected by a wide variety of natural and management processes, the effects of which are not clearly understood

• The methodology currently only includes N2O

• The methodology is significantly revised in the Revised 1996 IPCC Guidelines

3.73

Emissions from AgricultureEmissions from Agricultural Soils

Recommended Methodology:

N2O Emissions (103 tN/yr) = i(Fmn + Fon + Fbnf) x Ci x 44/28)

Where:• i = low, medium, high

• Fmn = amount of mineral fertilizer applied

• F = amount of organic material (animal manure and crop residues) applied

• Fbnf = amount of biological N-fixation added

• C = Emission coefficient

3.74

Emissions from AgricultureEmissions from Agricultural Soils

Ranges of Emission Coefficients for N2O from Agricultural Soils Tg (N2O-N):

Emission type Expert Group Alternative Recent

Recommendations Calculations2 Analyses3

19931

Low 0.0005 0.0014 0.0025

Medium 0.0036 0.0034 0.0125

High 0.039 0.037 0.0225

Footnotes1 Values were suggested by an expert group during the Amersfoot workshop (Bouwman and Mosier, 1993). They are not

representative of global figures because they are based on mineral fertilizer use for each type.2 In response to comments on the draft Guidelines, a range of coefficients was calculated based on figures in Table 5-9 of

the OECD/OCDE (1991) report.3 Provided by Mosier (1994) based on detailed analysis of currently available measurement data. In these Guidelines,

these are the recommended coefficients.

3.75

Emissions from AgricultureEmissions from Agricultural Soils

Revisions in the Revised 1996 Guidelines

• Revised methodology takes into account both direct and indirect emissions of N2O and includes additional sources of N that are applied, deposited or made available in the soil.

3.76

Possible Topics for Discussion

• How can an assessment team ensure analytical consistency across many different sectors?

• What is the best level of detail for an analysis in each sector?

• How can data limitations be addressed?