Biology 1b Evolution and Environment GCSE CORE Key words: sustainable, recycle, alternatives

Biology 1b Evolution and EnvironmentBiology 1b Evolution and EnvironmentGCSGCSEE

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Key words: sustainable, recycle, alternatives


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Objective

What is meant by sustainability?What is meant by sustainability?

Success Criteria

By the end of the lesson I:

• know what sustainable development is

• know how families can help to conserve resources by recycling, making homes energy efficient & avoid using cars

• can explain the consequences of using up the world’s resources


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Sustainability is not about doing less – it is about about doing more (but doing it doing more (but doing it with lesswith less).

Sustainable development means finding ways of reducing this need for resources and finding alternatives that are less polluting.

It means looking after the environment.

Sustainable technologies could go on forever go on forever without damaging the without damaging the environmentenvironment for our grandchildren or our grandchildren’s grandchildren.


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Unsustainable technology• Uses resources that cannot be replaced• Produces wastes that cannot be broken down• Steals from the future to feed the present


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Before crude oil and plastics were available, whales were a major source of raw materials for many countries.

A valuable resource?

oilcosmetics, candles and machine oil

teethbuttons andpiano keys

bonefertilizer

meathuman and pet food

skinbelts, shoesand luggage

IS THIS SUSTAINABLE?IS THIS SUSTAINABLE?


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Sustainable technology• Uses resources that are replaced regularly• Produces wastes that break down harmlessly• Protects the future


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Are countries Are countries justified in justified in claiming whales claiming whales need to be killed need to be killed to protect fish to protect fish stocks?stocks?

Phytoplankton are single-celled plants that grow in nutrient-rich coastal areas. Krill are tiny shrimp that feed on the phytoplankton, and which are the main food source for many sea creatures, including fish and whales.

Protecting fish stocks

Whales catch krill and small fish using a special filter in their mouth.


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Sustainable? Or not?Sustainable? Or not?

Air travel Motor cars

Farming Fishing


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Possible Alternatives

• For fuelFor fuel. Combustion of fossil fuels in cars . Combustion of fossil fuels in cars and aeroplanes are the biggest produces of and aeroplanes are the biggest produces of carbon dioxide gas. carbon dioxide gas. Why is this a problem?Why is this a problem?

• RecyclingRecycling what we already have eg plastics, what we already have eg plastics, aluminium cans. aluminium cans. How will this help?How will this help?

• Reusing landReusing land that has already been used for that has already been used for eg to build new homes on brown fields (land eg to build new homes on brown fields (land that had previously been used for building that had previously been used for building rather than on green fields). rather than on green fields). Why?Why?


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How could you make electricity generation more sustainable?

• Use renewable energy sources • Use non-polluting energy


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• Support more public transport systems• Encourage purchase of local resources and products• Use more energy-efficient vehicles• Build towns without need for cars

How could you make transport more sustainable?


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How could you make house building more sustainable?

• Use natural, low-energy materials in construction• Avoid waste-generating techniques• Make houses smaller and more energy efficient


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How could you make waste collection more sustainable?

• Recycle more• Avoid landfill wherever possible• Reduce waste creation (e.g. excessive packaging)• Use waste for new products (e.g. making fleeces out of plastic waste)


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What are pesticides?

insecticides kill insects

kill unwanted plants (i.e. weeds) herbicides

kill fungi (e.g. moulds and mildews)fungicides

The major problem with using pesticides is that they can accumulate along food chains, poison wildlife or washed off fields and into lakes and rivers, where they cause eutrophication

A pesticide is a substance used to prevent, destroy or repel pests.

Different types of pesticides include:


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Eutrophication


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140,000 miles of hedgerow

Agriculture causes the destruction of important habitats. Since 1949, the UK has lost:

Sustainable countrysideThe rising population means that more food must be grown, but this means that more land must be used for farming and agriculture.

95% of its lowland grassland

30-50% of its ancient lowland woods

40% of its lowland heaths on acid soils.


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Deforestation destroys habitats, but wood can still be harvested in a sustainable way by:

What is sustainable forestry?

replanting – new trees are planted to replace those that are cut down.

coppicing – harvesting the stems of young trees and allowing them to regrow.

However, developing countries may not have enough money to invest in sustainable forestry. How could these countries be helped?


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Multiple-choice quiz


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Objective

What is meant by sustainability?What is meant by sustainability?

Success Criteria

By the end of the lesson I:

• know what sustainable development is

• know how families can help to conserve resources by recycling, making homes energy efficient & avoid using cars

• can explain the consequences of using up the world’s resources

Documents

Biology 1b Evolution and Environment GCSE CORE Key words: sustainable, recycle, alternatives