Over the past decade, the focus has been on climate change—how the warming of the Earth from greenhouse gases is leading to conditions that worsen fires.

在过去的十年里，人们关注的焦点一直是气候变化，即温室气体导致的地球变暖是如何导致火灾恶化的。

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Such "fire scars" in long-lived species like giant sequoias allow him to estimate the past frequency of forest fires.

这些在长寿物种，如巨红杉中留下的火灾印迹，使得他能够估计过去森林火灾的频次。

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That is mainly because of the radioactive iodine that has already been detected around Fukushima after the explosions and fires it sustained in the past several days.

这主要是由爆炸后在福岛周围检测出来的已持续存在几天的放射性碘所致。

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According to the NOAA, June of 2012 had one of the lowest numbers of wildfires of any June in the past couple of decades, though a few large fires pushed up the total number of acres burned.

FORBES: Summer of the Shark, Global Warming Edition

Strong winds, dry conditions and unseasonably warm temperatures have fueled hundreds of wild fires across Texas and Oklahoma over the past several weeks.

NPR: Cattle Ranchers Struggle to Survive Amid Wildfires

Burned-out buildings and indications of oil fires lined the side of the road, as did people waving white flags as they walked or drove past the U.S. forces.

CNN: Coalition pounds Iraqi positions in north, south