Science: When the world turns ugly

Jim Holt

Arguing with global warming sceptics over the years, I have noticed an interesting evolution in their case. First, I heard that no warming was taking place. Then I heard from them that yes, there might be warming after all, but that it was not caused by human activity. Then I heard that yes, there m…

Witness: Butterflies on a Wheel
Encounter: The visions of Kurt Jackson