Heaven and Hell: Carl Sagan on global warming
Is good where it needs to be. But beyond all of the natural elements of change pay particular attention to the slash and burn logic he discusses. Especially considering that we're moving ever closer to the entire subject of climate change becoming more of a matter of National security. Kind of the invisible terrorist that nobody can aim at. Place that also into perspective with all of the wild fires burning out west as well as the less discussed element of agri-business destroying Earth's own natural defenses as mentioned in the video. NASA should be expected to play some role in that looking forward beyond the recent language that simply warms folks up to the effect of instilling importance or desparation in the matter.
But anyhow and to make a longer story short before I start rambling Humans need to be scrutinized a little more thorough in all of this than simply the air that they breath.