IN BRIEF

摘要

It's an ill wind. The north-western US has experienced 100 years of warming, leading to wildfires and infestations of pests like pine beetles. But the extra heat seems to be linked to natural changes in the winds of the Pacific Ocean rather than human-caused climate change. Since 1900, the north-western US, including northern California and Oregon, has warmed by about 0.8 ℃. James Johnstone of the University of Washington in Seattle wanted to see if global warning was responsible.