Global Warming is defined as the increase of the average temperature on Earth. As the Earth is getting hotter, disasters like floods, hurricanes and droughts are getting more frequent.
Human activities have led to large increases in heat-trapping gases over the past century. The global warming of the past 50 years is due primarily to this human-induced increase. Global average temperature and sea level have increased, and precipitation patterns have changed.
Human "fingerprints" also have been identified in many other aspects of the climate system, including changes in ocean heat content, precipitation, atmospheric moisture, plant and animal health and location, and Arctic sea ice.
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