I take no pleasure in the fact that the scientific predictions I’ve relayed to popular audiences turn out to be true.

There are good people, who are in politics - in both parties - who hold this at arm's length, because if they acknowledge it and recognize it, then the moral imperative to make big changes is inescapable.

The truth is that climate change is presenting the greatest challenge humanity has ever faced.

No controlling legal authority

We know that he has stored secret supplies of biological and chemical weapons throughout his country.

Mother Nature does not do bailouts.

It seems an easy choice - sacrifice the tree for a human life - until one learns that three trees must be destroyed for each patient treated. Suddenly we must confront some tough questions. How important are the medical needs of future generations?