Viewpoint: Yes, there is strong evidence that most of the global warming observed over the last 50 years is due to human activities. Viewpoint: No, present global warming is not due more to human activity than to natural geologic trends. Of all the...

the phenomenon of increasing average air temperatures near the surface of Earth over the past one to two centuries. Since the mid-20th century, climate scientists have gathered detailed observations of various weather phenomena (such as temperature,...

Few modern scientific concerns have achieved such notoriety as the possibility of relatively rapid anthropogenic global warming through increased CO2 emissions. This complex problem became a matter of considerable public attention during the 1980s, and...

Global warming is the gradual rise of the earth's near-surface temperature over approximately the last hundred years. The best available scientific evidence—based on continuous satellite monitoring and data from about 2,000 meteorological...

Increase in the global average surface temperature resulting from enhancement of the greenhouse effect, primarily by air pollution. In 2007 the UN Intergovernmental Panel on Climate Change forecasted that by 2100 global average surface temperatures...

The common term applied to the phenomenon more properly known as ‘global climate change’. The phenomenon is by no means universally accepted as a fact but the basic concept is that GREENHOUSE GASES in the earth’s atmosphere trap heat...

see Greenhouse...

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