On climate change, the science is clearer about what you need to do to get a real impact than... on counterterrorism.

I don't know the science behind climate change. I can't say one way or another what is the direct impact, whether it's man-made or not.

The scientific consensus is that climate change is real, urgent, and caused by humans. This science should be both supported and understood by anyone who hopes to lead NASA, one of our nation's top science agencies.

The basic science is very well established; it is well understood that global warming is due to greenhouse gases. What is uncertain is projections about specifics in the next few decades, by how much will the climate change.

Climate change is real. Climate change is being substantially increased by humans and the carbon we put into the atmosphere. And it appears to be speeding up. If science has made any mistakes, science has been underestimating it.

If Margaret Thatcher took climate change seriously and believed that we should take action to reduce global greenhouse emissions, then taking action and supporting and accepting the science can hardly be the mark of incipient Bolshevism.

Of course I would disagree that there's a definitive science that has concluded that mankind has turned the earth's thermostat up and that we can turn the earth's thermostat down at will, we just haven't yet found the will. That's the argument on climate change.

We should be concerned about the impact of climate change on vulnerable populations, without question. There is nothing automatic about adaptation. But it's clear that there is simply no science that supports claims that rising sea levels threaten civilization much less the apocalypse.

How is it that, in the face of overwhelming scientific evidence, there are still some who would deny the dangers of climate change? Not surprisingly, the loudest voices are not scientific, and it is remarkable how many economists, lawyers, journalists and politicians set themselves up as experts on the science.

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