But scientists have found that climate change - including longer, hotter and drier fire seasons, diminishing snowpack and lengthening droughts - have already measurably worsened the size and scale of fires in the western United States.

但科学家们已经发现，气候变化——包括山火季节变长，变热，变干燥，积雪变少，干旱时间变长等——已经显著恶化了美国西部的火灾规模。