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My first inclination is to be a bit skeptical about the claims that human-produced carbon dioxide is the direct contributor to global warming.

Faced with the evidence, many deniers have started to admit that global warming is real, but argue that humans have little or nothing to do with it.

Global warming is real - it is man-made and it is an important problem. But it is not the end of the world.

Most North Americans know that human-caused global warming is real, even if political leaders don't always reflect or act on that knowledge.

There is a majority of scientists that say that global carbon emissions by humans causes some changes in the climate.

Humans have obviously contributed a great deal of carbon to the atmosphere. So we are warming the planet up.

I'm absolutely convinced that the very small global warming we are experiencing is the result of natural causes. It's a cyclical phenomenon in the history of the Earth. The role of man is very small, almost negligible.

Global warming is real. It is happening today. It is being charted by our satellites. It is being charted by our scientists. It is being charted by those of us in this body, and I think the real key is if we are ready to admit that fact and take the action to make the necessary conversion.

The most important thing about global warming is this. Whether humans are responsible for the bulk of climate change is going to be left to the scientists, but it's all of our responsibility to leave this planet in better shape for the future generations than we found it.

The question of whether or to what extent human activities are causing global warming is not a matter of ideology, let alone of belief. The issue is simply one of risk management.