b1b 8.3 global warming aqa science © nelson thornes ltd 2006 1

AQA Science © Nelson Thornes Ltd 2006 1

B1b 8.3 Global warming



Human activities

Photodisc 4(NT)

K.WReradiate Acid rainCombustion Sulphur DioxideGlobal warming Nitrogen monoxideMethaneRice paddy fields

Population increase causes…..



Name Fuels

Plant=coal Animal=oil

• Fuels



Combustion

When we burn fossil fuels we produce….

Petrol+Oxygen --- ? + ?



What else increase Carbon dioxide?



Rising levels of carbon dioxide



The greenhouse effect



Global warming

• Carbon dioxide is released when fuels like gas, coal, oil, petrol and wood are burned.

• Greenhouse gases cause the temperature of the Earth to rise slowly.

• This causes climate change.

• Methane released from cattle and rice fields is also a greenhouse gas.

Most fuels contain carbon

Carbon dioxidereleased when fuel

burned

Extra carbon dioxide in the air slows downheat loss from Earth

Climate change



Task-20mins to complete

• In sentences answer the following questions.– Draw an annotated diagram of global

warming using page 125.(Ie Fig 1)

– What are the effects of global warming?



Acid rain

Digital Vision 15(NT)

Sulphur dioxide

Nitrogen dioxideAnd

Monoxide



Acid rain• Sulfur dioxide is released

when fossil fuels like coal and oil are burned.

• Acid rain damages rivers and lakes, making them more acid, so killing fish.

• Acid rain damages trees.• Acid rain damages limestone

buildings. • Nitrogen oxides released in

car and jet fumes also cause acid rain.

Digital Vision (NT)



Formation of acid rain

Sulfurimpurities in coal and oil

Sulfurdioxide releasedwhenburnt

Dissolves in rainand clouds

Falls as acidrain, less thanpH5.5



Formation of acid rain



Task 10mins

• What activities from Sulphur dioxide and Nitrogen oxide and Nitrogen dioxide?

• How is acid rain formed?

• Draw a quick diagram to describe how acid rain is formed (page 123 fig 3)

• What are the effects of acid rain?



Preventing acid rain

• International agreements to reduce sulfur dioxide pollution.

• Energy efficiency means less coal burned to make electricity.

• Ultra low sulfur petrol.• Alternative energy sources like natural gas,

solar, wind farms and nuclear.



The effect of international agreements



Get the gas right

Holes in the ozone layer

Sulfur dioxideAcid rain

Carbon dioxideGlobal warming

GasPollution problem

CFCs



The carbon cycle

• C entering C exiting

• Respiration Fossil formation• Dissolve in water• Combustion• Photosynthesis



Preventing global warming

• Energy efficiency means less fuel burned to make electricity.

• Fuel cell buses.

• Renewable energy sources like water power, solar, wind farms, bio fuels.

• Nuclear power.

• The Kyoto agreement to reduce CO2 emissions.



Supermarket plastic bags

Each one takes 100 years to rot…..Digital Vision 15(NT)



Biodegradable plastic bags

This is not the only supermarket to use biodegradable bags.

…but not these ones

Paul Connell



Symphony plastics make a range of biodegradable plastic products.www.degradable.net

Look out for their flash animation on:http://www.degradable.net/how/summary.shtml

See alsohttp://www.biopac.co.uk/

They have lots of pictures of their products and ‘environmental information’



Sustainable developmentSustainable developmentB1b 8.4B1b 8.4 What is sustainable development? What is sustainable development?


B1b 8.3 Global warmingSustainability is not about doing less – it is about doing more (but doing it with less). Sustainable development combines human progress and environmental stability. It means looking after the environment. Sustainable technologies could go on forever without damaging the environment for our grandchildren or our grandchildren’s grandchildren.



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



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



Sustainable? Or not?Sustainable? Or not?

Air travel Motor cars

Farming Fishing


B1b 8.3 Global warmingHow could you make electricity generation more

sustainable?

Click here to play video


B1b 8.3 Global warmingHow could you make electricity generation more

sustainable?

• Use renewable energy sources • Use non-polluting energy




How could you make transport more sustainable?




• 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?



B1b 8.3 Global warmingHow could you make housebuilding more sustainable?



B1b 8.3 Global warmingHow could you make housebuilding more sustainable?

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



B1b 8.3 Global warmingHow could you make waste collection more

sustainable?



B1b 8.3 Global warmingHow 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)




Indicator species

• K.W

• Planning permission

• SSIS

• Lichens

• Sustainability



Planning permissionField studies take place-

To predict the effect on the environment

We can use indicator species as indicators of pollution

Brown field site-Usually in towns/cities.They have already been used. Often sites of old buildings,factories even rubbish tips!

Green field sites- Country side that has not been built on



• Interesting/Unique landscape.

• Home to rare species/Breeding grounds

•

Sites of Scientific interest



Lichens



Water pollution

• Invertebrates are used.

Blood worm



Plenary

Using the keywords Describe the green house effect.K.WCombustionGlobal warmingMethaneRice paddy fieldsReflection

b1b 8.3 global warming aqa science © nelson thornes ltd 2006 1

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