The United States is the only nation that can lead the world toward a solution on climate change.

In physics there's the old law for every action there's a equal amount of reaction. Sometimes that's true in politics. If somebody's out there making nonsensical statements, but wielding power behind them a lot of people say, "Well, I need to react to that." Another reason for the increased prominence of the climate-change issue is the Paris Agreement itself. It's not a small thing when just about every nation in the entire world comes together and makes an historic agreement like this. It's a big deal. And the old cliché "The train is leaving the station" kind of applies.

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.

Speaking from my own religious tradition in this Christmas season, 2,000 years ago a homeless woman gave birth to a homeless child in a manger because the inn was full.

It should be lifted above partisanship because it's a question of survival. It's a moral issue.

Our new technologies, combined with our numbers, have made us, collectively, a force of nature

Third world nations are producing too many children too fast...it is time to ignore the controversy over family planning and cut out-of-control population growth.