Dr. Kenneth Tapping is worried about the sun. Solar activity comes in regular cycles, but the latest one is refusing to start. Sunspots have all but vanished, and activity is suspiciously quiet. The last time this happened was 400 years ago -- and it signaled a solar event known as a "Maunder Minimum," along with the start of what we now call the "Little Ice Age."
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I'm not gonna get any more upset about this on than I did global warming, we'll have to adapt one way or the other and we will. Still, this may be based on better data anyway...
But wait, maybe we can just pump more carbon into the air and warm things up... if that worked...:-)