Presentation on theme: "What causes Global Warming?"— Presentation transcript:
1What causes Global Warming? What is the Greenhouse Effect?
2Thermal Power stations make electricity A ‘clean’ form of energy
3By burning fossil fuels Like coal oil and gas.Which releases a lot of carbon dioxide gasWhich is not so ‘clean’!
4Because Carbon Dioxide adds to the Greenhouse Effect.
5Carbon dioxide is is called a ‘greenhouse gas’ Because a greenhouse works the same way – letting light heat in but not letting it out again.
6The Greenhouse Effect is a natural and important ‘good’ thing. Without it our planet Earth would be totally frozen
7The problem is humans are making the Greenhouse Effect too strong So the world is getting ‘hot and bothered’.
8Here are the main greenhouse gases by volume. Put the Heading ‘Global Warming’ – draw this graph as a divided bar and describe in writing what this graph tells us.
9CFCs are another greenhouse gas. The richer countries (MEDCs) have banned them.This is because they stayed doing damage in the air for 1000 years.
10Methane is another greenhouse gas. A lot gets produced in cows stomachs.(We could use this instead instead of burning coal!)
11Rice paddy fields give off lots of methane Another greenhouse gasThe scientists are trying to measure how much is released ….Because … The concentration of methane in the atmosphere has increased by about 50% in the last 40 years.
12So Global Warming is an environmental problem for the whole world It is caused by the humans releasing more and more greenhouse gases adding to the greenhouse effect.