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Global warming in the next century could cause a significant increase in the productivity of high-elevation forests of the Pacific Northwest, a new study suggests. However, forests at lower elevations - which in recent years have accounted for more than 80 percent of the region's timber harvest - could face a decline in growth.

The possibility that climate change might simply be a natural variation like others that have occurred throughout geologic time is dimming, according to evidence in a Proceedings of the National Academy of Sciences paper published October 19.

Japan, the world's fifth-biggest air polluter, offered a 0 million yen-denominated loan Sunday to Indonesia, the world's third-largest air polluter, to help tackle global warming, Japanese officials said.