So imagine a world 6 degrees warmer. It's not going to recognize geographical boundaries. It's not going to recognize anything. So agriculture regions today will be wiped out.

The biggest gains, in terms of decreasing the country's energy bill, the amount of carbon dioxide we put into the atmosphere, and our dependency on foreign oil, will come from energy efficiency and conservation in the next 20 years. Make no doubt about it. That's where everybody who has really thought about the problem thinks the biggest gains can be and should be.

Somehow we have to figure out how to boost the price of gasoline to the levels in Europe.

Of course we don't want the price of gasoline to go up, we want it to go down.

However, when my parents married in 1945, China was in turmoil and the possibility of returning grew increasingly remote, and they decided to begin their family in the United States.

If there is a regulation that says you have to do something-whether it be putting in seat belts, catalytic converters, clean air for coal plants, clean water-the first tack that the lawyers use, among others things, and that companies use, is that it's going to drive the electricity bill up, drive the cost of cars up, drive everything up. It repeatedly has been demonstrated that once the engineers start thinking about it, it's actually far less than the original estimates. We should remember that when we hear this again, because you will hear it again.

While we cannot accurately predict the course of climate change in the coming decades, the risks we run if we don't change our course are enormous. Prudent risk management does not equate uncertainty with inaction.