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.

I'm not a vegetarian, but I have cut back sharply on the meat that I eat.

We have arrived at a moment of decision. Our home - Earth - is in grave danger. What is at risk of being destroyed is not the planet itself, of course, but the conditions that have made it hospitable for human beings.

The climate crisis is not a political issue; it is a moral and spiritual challenge to all of humanity. It is also our greatest opportunity to lift global consciousness to a higher level.

In a time of social fragmentation, vulgarity becomes a way of life. To be shocking becomes more important - and often more profitable - than to be civil or creative or truly original.

The ten hottest years in the atmospheric record, going back only 160 years, have been in the last eleven years.

The scientific evidence of how serious this climate crisis is becoming continues to amass week after week after week.