We need to put a price on carbon, and that's what cap-and-trade does and that's also what a CO2 tax does. As long as our current valuation in the marketplace tells us every minute of every day that it's perfectly… — Al Gore Copy Share Image
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… — Vinod Khosla Copy Share Image
