1 What is positive about global warming?
2 What could happen?
3 Does global warming exist?
4 ft has begun!
5 The greenhouse effect
For many years, scientists have been arguing about global warming While they don't all agree about what this might mean for Planet Earth, many think it is going on — and that we can do something about it. We need a few more years to gather facts before anyone can say for sure But rf global warming is happening, it will take years to fix. People need to start now to do things to stop it.
Some global warming is good Without it. Earth would be a ball of ice. The average (средняя) temperature would be about 5 degrees Fahrenheit not 60 degrees as it is today No life as we know it could live here.
There are many types of gases m our atmosphere Some of them absorb the heat from the sun and control our climate 'Greenhouse gases' are those that hold the heat around the planet's surface When we increase the level of these gases, we upset the balance These extra gases trap even more heat.
Some scientists say global warming has already started to change the environment. The Earth's temperature has risen one degree Fahrenheit this century. Many scientists believe it could rise from two to eight degrees Fahrenheit in the next hundred years. This would be the fastest rise in 10.000 years. Harsh weather has hit the United States in recent years. The Mississippi flooded several times. Hurricanes Hugo and Andrew smashed into the east coast.
Sea levels could rise, ice sheets could melt and add to the water level. As water warms, it takes more space. The sea level has risen about 5 inches during this century. Scientists believe sea levels could rise more than 3 feet in the next hundred years Many places near the coast would be in danger of flooding (наводнения). In some places a warmer climate may seem better But plants and animals are used to the climate that has existed for years. If the climate change is too large and too fast, some plants and animals could realty suffer They could even die out Weather could become more violent and extreme In some places there would be more forest fires. But in other areas there would be more rain and snow storms and floods.