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For the U.S., I think we should have a carbon tax, for environmental reasons.

Putting a tax on carbon could be an effective approach for curbing global warming pollution.

If you have a carbon cap and trade system, there'd be an agreed-to limit the amount of carbon we emit. That changes the economic picture for fossil technologies and for the renewable technologies. It makes the renewable technologies more attractive and the fossils less attractive.

As is widely accepted, putting a price on carbon pollution is the lowest cost and most efficient way to tackle dangerous climate change.

The cap-and-trade plan is more market driven than anything else. If you want to discourage carbon use, you have to make it more expensive, but what is crucial is that this be a worldwide program that includes China and India.

A cap on carbon is important because it sets a specific goal for reducing carbon emissions 80% by 2050.

Some solutions are relatively simple and would provide economic benefits: implementing measures to conserve energy, putting a price on carbon through taxes and cap-and-trade and shifting from fossil fuels to clean and renewable energy sources.

The struggle against poverty in the world and the challenge of cutting wealthy country emissions all has a single, very simple solution... Here it is: Put a price on carbon.

We hear people talk about putting a price on carbon, but they won't talk about how much that price of carbon is.

Many have criticized a federal carbon tax, saying that it would increase energy costs. Some continue to oppose it even when that revenue would be used to reduce other taxes in what's known as a tax swap.