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Decades of scientific research has proven that carbon pollution is harmful to human health and causes global warming.

Natural gas obviously brings with it a number of quality-of-life environmental benefits because it is a relatively clean-burning fuel. It has a CO2 footprint, but it has no particulates. It has none of the other emissions elements that are of concern to public health that other forms of power-generation fuels do have: coal, fuel oil, others.

CO2 is not a pollutant in any normal definition of the term.

Even if producing CO2 was good for the environment, given that we're going to run out of hydrocarbons, we need to find some sustainable means of operating.

We have known since the 1800s that carbon dioxide traps heat in the atmosphere. The right amount keeps the climate conducive to human life.

CO2 is the exhaling breath of our civilization, literally... Changing that pattern requires a scope, a scale, a speed of change that is beyond what we have done in the past.

Organisms don't think of CO2 as a poison. Plants and organisms that make shells, coral, think of it as a building block.

The simplest way to remove carbon dioxide, the main greenhouse gas, is to grow plants - preferably trees, since they tie up more of the gas in cellulose, meaning it will not return to the air within a season or two. Plants build themselves out of air and water, taking only a tiny fraction of their mass from the soil.

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

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.