How climate change drives the spread of invasive plants

As the climate warms, the number of alien species on every continent is expected to increase 36% by 2050. Some alien species—that is, plants or animals that live outside their natural range—are invasive and can harm ecosystems ...

Heat wave risk hovers over Paris Olympics

Scorching summer heat is hard to imagine now in mid-winter Paris, but in six months when the world's athletes arrive for the Olympics, another pounding heat wave would spell trouble for organizers.

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