climatic changes

BY -

CLIMATE CHANGING HOW

FOSSIL FUEL

GLOBAL WARMING WHAT

DEFORESTATION

TEMPERATURE

ICE

MELTING

?EARTH HUMAN IM

PACT

CLIMATE Climate describes the typical conditions of temperature, relative humidity, cloudiness, precipitation, wind speed and direction, and other meteorological factors that prevail globally or regionally for extended periods.

Weather describes the hourly or daily conditions that people experience each day.

DIFFERENCE : WEATHER and CLIMATE

WEATHER

Climate is what you expect; weather is what you get !

what is CLIMATE CHANGE ?

Climate change is a long-term shift in weather conditions identified by changes in temperature, precipitation, winds, and other indicators.

Climate change can involve both changes in average conditions and changes in variability, including, for example, extreme events.

There have been long-term and short-term climate cycles for hundreds of millions of years. Dramatic and rapid climatic changes. IPCC report of 2007 said : Earth’s climate is changing rapidly and that human activities are

the primary factors causing this change. These factors are external to the climate system, they are referred to as 'climate forcers‘ Not all of those factors that have been responsible for changes in earth's climate in the

distant past are relevant to contemporary climate change.

CLIMATE CHANGING ?H

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FACTORSNATURAL HUMAN

Burning fossil fuels

Greenhouse effect

Deforestation

Pollution

Volcanic activity

Earth’s orbit

Solar Output

Ocean currents

NATURAL CAUSES

1. VOLCANIC ACTIVITY

2. CHANGES IN SOLAR RADIATION

3. VARIATIONS IN THE EARTH’S ORBIT - CYCLES

HUMAN CAUSES1.

2. Deforestation

Forests are cut down or burned

can no longer store carbon, and the carbon is released to the atmosphere.

Act like a blanket and restrict the rate at which Earth’s surface can radiate heat to space

Result is global warming Today, current levels of

carbon dioxide in the atmosphere are higher than at any time during the last 650,000 years.

2010 was the hottest year on record, worldwide.

3. Burning of fossil fuels

Fossil fuels are the carbon-rich remains of plants and animals that have been buried and compressed under sediments for millions of years.

non-renewable resources more than 90% of greenhouse gas

emissions come from the combustion of fossil fuels.

Scientists’ Predictions In 2007, the IPCC published a report

predicting that average global surface temperatures will likely rise by an additional 2 to 11.5 degrees F (1.1 to 6.4 degrees C) above the 1980s-1990s average by 2100.

Result in an increase in global sea level up to two feet or more.

An enormous impact on our planet’s people, ecosystems, cities, and energy use.

If we take aggressive action to reduce emissions, the temperature change could be modest.

If we continue on our present course, however, the amount of change will be substantial.

changes are anthropogenic