Extinction and eco-collapse: currently proceeding 1000-10,000 times faster than normal, eliminating the ecosystems that humans and wildlife need to survive. Mainly caused by agriculture and land development. Overheating: a climate approaching out-of-control as nine huge "feedbacks" from the Earth system itself make it even faster, hotter and more turbulent than man-made factors (like fossil fuels and land clearing) alone. Global poisoning: five times larger and 10 times more deadly even than climate, human chemical emissions are the largest and most underestimated threat to planetary health and survival. Nuclear holocaust: with 70 nations still committed to nuclear arms and conflict, scientists...