Экология: глобальное потепление.
презентация к уроку по английскому языку (7 класс) на тему

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With the world on the brink of catastrophic climate change, it is time to get serious. Humans are pouring carbon dioxide into the atmosphere much faster than plants and oceans can absorb it. In December 2009,governments of the world will meet in Copenhagen to decide the future of the our planet. Let is hope they get it right.

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What is global warming? Carbon dioxide and other gases warm the surface of the planet naturally by trapping heat from the sun in our atmosphere .This is a good thing because it keeps our planet habitable

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However, by burning fossil fuels such as coal , gas and oil and cutting down forests we have dramatically increased the amount of carbon dioxide in the Earth’s atmosphere and temperatures are rising fast!

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The leading cause of global warming is from water vapor, then carbon dioxide emissions, nitrous oxides, and chlor Thofluorocarbons (used in household appliances like air conditioning). Chlorofluorocarbons are expected to be eliminated and put out of use by 2030 to help slow down global warming. The biggest business sectors that are contributing to global warming are the following: Industry, Transportation, Residential, Commercial, Agriculture. Methane is the second biggest cause of greenhouse warming. Gas from cows is a big contributor to global warming.

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A big enough volcano eruption could cool the earth for one or two years because sulfuric acid from the explosion would combine with water vapor to form a “shield” that would reflect some sunlight away from earth. Such an eruption would be quite catastrophic, though. .

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Is global warming dangerous? Most scientists agree that global warming is very dangerous. We can already see many changes: Average temperatures around the world are rising, especially in eastern Russia, western Canada and Alaska. Arctic ice is quickly disappearing. Polar bears and already suffering from the loss of sea ice. Glaciers and mountain snows are quickly melting. The flow of ice from glaciers in Greenland has more than doubled over the past decade.

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The number of strong hurricanes over the ocean has almost doubled in the last 30 years. The number of heat waves, droughts and wildfires is increasing. At least 279 kinds of plants and animals are already responding to global warming, moving closer to the poles.

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What will happen if our planet continues to get warmer? Sea levels will rise and cities on coasts will disappear under the water. Polar bears and many other animals will die out There will be more floods, especially near coasts and rivers. Many lakes and rivers will dry up. There will be more heat waves, droughts and wildfires Hurricanes, tornadoes and other storms will become more common. Places that usually get lots of rain and snowfall will get hotter and drier.