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CO2

In mid-April 2009, the U.S. Environmental Protection Agency – EPA – declared that carbon dioxide and five other greenhouse gases associated with climate change are pollutants.

Dan Greenbaum: [---1---]

You're listening to Dan Greenbaum of the Health Effects Institute, an independent research organization heavily funded by the EPA to study the health effects of air pollution.

Dan Greenbaum: Should this finding be solidified, then one could expect they would probably propose some very specific standards for greenhouse gas emissions from automobiles. [---2---]

Greenbaum said this so-called 'endangerment finding' by the EPA will help lead to the first regulation of greenhouse gases in the United States.

Dan Greenbaum: Carbon dioxide is a by-product of all combustion, and there isn't just a simple control to capture it and make it go away. [---3---]

This is E&S, a clear voice for science.

【視聽版科學(xué)小組榮譽(yù)出品】
What they've done here is drawn this kind of connection between CO2 and climate change and the changes to temperature and the effects that will have on conventional air pollutants and therefore on public health. They could also potentially do it for other sources as well. And so it will take much, much more effort to improve fuel efficiency and take other kinds of actions in order to really reduce carbon dioxide substantially.