I always cheer up immensely if an attack is particularly wounding because I think, well, if they attack one personally, it means they have not a single political argument left.

Sustainability isn't just a trend—it's a responsibility we all share.

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

The greatest threat to our forests isn't logging—it's indifference.

有时候最难的事情和正确的事情是同一件事。