Earth & Environment

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illustration of Earth's magnetic field

MAGNETIC SHIELD  The planet’s magnetic field isn’t on the cusp of a catastrophic flip of the magnetic poles, new lava analysis suggest. A magnetic reversal would weaken Earth’s magnetic field, causing auroras closer to the equator, as seen in this artist’s illustration. 

thin ice in Arctic Sea

WARM NIGHTS  During autumn and winter, thinning Artic sea ice increases heat-trapping water vapor in the air, leading to more ice loss, new research suggests.

cows grazing

GREENER COWS  These cows at the Ellinbank Dairy Research Centre in Victoria, Australia, wear backpacks that measure their methane output.

Earth & Environment

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