许多专家认为火灾的突然增加有几个原因。
Many experts believe there are several reasons for this sudden increase in fires.
在西班牙南部，温室的突然增加改变了当地的变暖趋势。
In Southern Spain, the sudden increase of greenhouses has changed the warming trend locally.
世界各地的海洋中，蕨类植物的孢子数量突然增加，这种现象被称为“蕨类植物峰值”。
The fern spike is the term given to this sudden increase in the abundance of fern spores blown into the oceans around the world.
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