POLL: Are Humans Causing Global Warming?

A saguaro cactus at sunset. (Image credit: stockxpert)

A new study concludes Arctic air temperatures in the 1990s were the warmest in the last 2,000 years and were a result of rising greenhouse gas levels. Let us know what you think about the evidence to date by voting and commenting below. Also click here for more news and information about global warming.

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