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Sadly, in the name of progress, we have polluted the air, water, soil and the food we eat.

We're running the most dangerous experiment in history right now, which is to see how much carbon dioxide the atmosphere... can handle before there is an environmental catastrophe.

I am not convinced the Clean Air Act was ever intended to regulate or classify as a dangerous pollutant something as basic and ubiquitous in our atmosphere as carbon dioxide.

Approximately 80% of our air pollution stems from hydrocarbons released by vegetation, so let's not go overboard in setting and enforcing tough emission standards from man-made sources.

What I have found most surprising is the amount of damage we have done to environment in the course of my lifetime - not even five and a half decades.

The U.S. has a proud history of cleaning up our air through technological innovation. We did it with leaded gas, acid rain and countless other pollutants, and we can do it with carbon pollution, too.

In tough times, some of us see protecting the climate as a luxury, but that's an outdated 20th-century worldview from a time when we thought industrialization was the end goal, waste was growth, and wealth meant a thick haze of air pollution.

We're not environmentally doing very good things to this planet, and we might not be around too long.

It isn't pollution that's harming the environment. It's the impurities in our air and water that are doing it.

Modern life would not be possible if it were not for chemicals, nor would modern natural gas production.