Iceland erosion forests sheep grazing

Erosion has affected three-quarters of Iceland

Trees once covered around 30% of Iceland. Centuries of forest use, sheep grazing, and worsening climate contributed to erosion across three-quarters of the country. Forest cover has increased sixfold since the 1990s, but planted forests do not compare with the original forests.

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People lived on Taiwan 20,000–30,000 years ago, when it was still physically connected to mainland Asia. Rising seas severed that connection about 10,000 years ago.

Box jellyfish avoid objects without sharp vision

Box jellyfish use vision to avoid objects, even though their lenses form unfocused images with limited detail. Their sight is useful without giving them a sharp picture.

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Iceland erosion forests sheep grazing

Erosion has affected three-quarters of Iceland

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