Some scientists have been sounding the global warming alarm bells for more than a decade, but lawmakers spent those years arguing over whether the grim forecasts were true. Now, in 2007, global warming is in the news every day and infiltrating pop culture. Americans are seeing images of polar bears clinging to their melting ice floes. Al Gore's documentary about global warming won an Oscar. Presidential candidates know it's on the minds of voters, and have vowed to make it a top priority in their campaigns. Governments at all levels - from the U.N. down to local cities - are racing to find ways to reduce emissions.

What do you think? Has the public consciousness of global warming reached a tipping point? Will the combination of individual, corporate and governmental actions lead to real, tangible change? What needs to happen?

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The vast majority of scientific studies on global warming conclude that the average global temperature is rising. Questions remain as to how fast it will adversely affect the climate and what should be done about it. In the documentary film An Inconvenient Truth, Al Gore suggests several measures for reducing green house gases that heat the earth.

What do you think? Have you made any lifestyle changes in response to global warming?

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