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The carbon dioxide concentration in the atmosphere is measured. It's uncontroversial. It's going up. We know that has a tendency to warm the atmosphere and we should be worried about that.

"Lord Martin Rees, Eminent British Scientist". "Sunday Profile" with Monica Attard, www.abc.net.au. March 28, 2010.
The carbon dioxide concentration in the atmosphere is measured. It's uncontroversial. It's going up. We know that has a tendency to warm the atmosphere and we should be worried about that.