1. Global Warming Learning objectives: 1. To understand the greenhouse effect and why global warming occurs 2. To understand the impact that global warming could have upon the Earth

2. Global warming!!! Increase in the Earth’s temperature- over the next 100 years the temperature is predicted to rise by 2-3 degrees C. Increase in the Earth’s temperature- over the next 100 years the temperature is predicted to rise by 2-3 degrees C. But why could this happen??! But why could this happen??! The GREENHOUSE EFFECT The GREENHOUSE EFFECT

3. The Greenhouse Effect The earth is surrounded by GREENHOUSE GASES The earth is surrounded by GREENHOUSE GASES They let in heat from the sun but prevent much of it from escaping They let in heat from the sun but prevent much of it from escaping This layer acts like a greenhouse!!! This layer acts like a greenhouse!!!

4. What produces these greenhouse gases? Basically: economic activity since the Industrial Revolution 200 years ago Basically: economic activity since the Industrial Revolution 200 years ago Burning fossil fuels produces carbon dioxide Burning fossil fuels produces carbon dioxide Fossil fuels: oil, natural gas, coal Fossil fuels: oil, natural gas, coal

5. Greenhouse gases As more greenhouse gases are produced, more of the sun’s energy is prevented from escaping and GLOBAL WARMING occurs As more greenhouse gases are produced, more of the sun’s energy is prevented from escaping and GLOBAL WARMING occurs Main greenhouse gas: Carbon dioxide Main greenhouse gas: Carbon dioxide

6. Impact of global warming Glaciers melt Glaciers melt Rise in sea level because of glaciers melting Rise in sea level because of glaciers melting Increased flooding Increased flooding More extreme weather More extreme weather Increased desertification Increased desertification Change in vegetation Change in vegetation Some plants and animals extinct in certain areas Some plants and animals extinct in certain areas

7. Effects of global warming: Retreat of glaciers and valleys; vegetation

8. Global warming and effect upon landscape

9. Lakes and glacial valleys

10. Millions battle South Asia floods, 12/7/04 over two million people had to flee their homes in India and Bangladesh over two million people had to flee their homes in India and Bangladesh 1/3 Bangladesh affected,3 million people marooned, 1000s searching for shelter and several killed. 1/3 Bangladesh affected,3 million people marooned, 1000s searching for shelter and several killed.(www.bbc.co.uk)

11. Therefore: Global warming is a MAJOR issue that will affect all of us over the next century!!! Global warming is a MAJOR issue that will affect all of us over the next century!!!