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‘Earthrise,’ a photo of the Earth taken by Apollo 8 astronaut Bill Anders, Dec. 4, 1968. NASA/Bill Anders via Wikipedia

Will the Earth last forever?

The Earth isn’t permanent, but it was here for four billion years before humans arrived and should be here for several billion more.
Amsterdam, Netherlands. Planting trees in urban areas can reduce the impacts of urban heat islands. Dutch_Photos/Shutterstock

Planting more trees could reduce premature heat-related deaths in European cities by a third – new research

In 2015, 6,700 premature deaths were caused by urban heat – this can be reduced by a third by planting more trees.
Bad air pollution and extreme heat each raise health risks, but they’re worse combined. Brian van der Brug/Los Angeles Times via Getty Images

Extreme heat and air pollution can be deadly, with the health risk together worse than either alone

The worst effects are during high nighttime temperatures, something happening more often with climate change. Wildfire smoke adds to the risk.
Is it better to cool your house all day, or adjust the A/C setting on your way out the door? Westend61 via Getty Images

Does turning the air conditioning off when you’re not home actually save energy? Three engineers run the numbers

Energy modeling software provides insight into whether letting your A/C relax while you’re gone all day will save you energy – and money.

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