The Evidence
Many people still argue about the reality of global warming, but there’s a lot of evidence to support it. Various studies show that:
Global surface temperatures have increased by between 0.4 and 0.8ºC since the late 19th century and by about 0.2 to 0.3°C over the last 40 years, which is the period with most reliable data.
Snow, mountain glaciers and Arctic sea ice in the northern hemisphere are all melting. Alaska’s permafrost temperature has increased 0.5ºC to 1.5ºC since 1980 with resulting forest damage, sinking roads and buildings, eroding tundra river banks, changes in tundra vegetation and increased carbon dioxide and methane emissions from thawed peat. Alaska’s glaciers are also receding at twice the rate previously thought.
Over the last 100 years, the global sea level has risen by about 10 to 25 cm.
Rainfall around the world has risen by about 1%. Many Indian states, such as Bangladesh and Orissa, have suffered severe flooding in recent years. If global warming continues, the situation is likely to get worse, as floods bring disease and kill crops.
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Climate Change
Quick Facts
Introduction
What is Global Warming ?
The Evidence <<
How Much Hotter ?
Pressures on Antarctica
Arguments Against It
The Political Response
Conclusion
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