By JR Minkel, Scientific American Known variations in the sun’s total energy output cannot explain recent global warming, say researchers who have reviewed the existing evidence. The judgment, which appears in the September 14 Nature, casts doubt on the claims of some global warming skeptics who have argued that long-term changes in solar output, or luminosity, might be driving the current climate pattern. The evidence for human-induced global warming is neatly captured in a...

