The survival of the United States of America as we know it is at risk. And even more — if more should be required — the future of human civilization is at stake.

In a free society, there comes a time when the truth - however hard it may be to hear, however impolitic it may seem to say - must be told.

The spiritual sense of our place in nature... can be traced to the origins of human civilization... The last vestige of organized goddess worship was eliminated by Christianity.

I pledge to you today that as president, in my first budget, I will introduce the largest increase in special education ever.

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.

We need to put a price on carbon. This needs to be a priority for all of us in how we vote.

Two thousand scientists, in a hundred countries, engaged in the most elaborate, well organized scientific collaboration in the history of humankind, have produced long-since a consensus that we will face a string of terrible catastrophes unless we act to prepare ourselves and deal with the underlying causes of global warming.