It’s been known that plantscommunicate with each other, but biologists didn’t know how they did it. It turns out they do it by making "clicking" sounds.

Some plants use smell to communicate. For instance, plants like cabbage can emit a volatile gas that warns their vegetable neighbors that danger is nearby–anything from caterpillars to garden shears.
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Despite pressure from big business and power companies, a federal appeals court upheld first regulations that will reduce the gases blamed for global warming. This may be the most significant decision on climate change since a 2007 Supreme Court ruling that greenhouse gases could be controlled as air pollutants.

The rules will reduce the emissions of six heat-trapping gases from large industrial facilities, as well as from car exhaust. Industry groups vow to continue the fight.
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