german researchers ① have identified a previously unknown source of methane, a potent greenhouse gas. the european space agency envisat satellite detected huge clouds of methane over forested areas, and scientists were confused. they thought methane ② was produced only in oxygen-poor envirnments like swamps, where decomposition occurs. in experiments, scientists were amazed ③ to see chemical sensors detecting methane when a variety of plants were placed in a room originally filled with methane-free air. higher hear seems to increase the rate at ④ that plants produce methane which could explain why levels of methane were high hundreds of thousands of years ago ⑤ when global temperatures were warmer.

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