What is climate change? Climate change describes a change in the typical weather for a region — such as high and low temperatures and amount of rainfall — over a long period of time. Scientists have observed that, overall, Earth is warming. In fact, many of the warmest years on record have happened in the past 20 years.
The world is now warming faster than at any point in recorded history. Warmer temperatures over time are changing weather patterns and disrupting the usual balance of nature. This poses many
Introduction. Created and produced by QA International. © QA International, 2010. All rights reserved. www.qa-international.com. The rise of air temperatures near Earth 's surface over the past one to two centuries is known as global warming.
How do we know climate change is really happening? Climate change is often cast as a prediction made by complicated computer models. But the scientific basis for climate change is much broader, and
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explanation text about global warming
