Excess nitrogen puts butterflies at risk

Nitrogen from agriculture, vehicle emissions and industry is endangering butterflies in Switzerland. The element is deposited in the soil via the air and has an impact on vegetation—to the detriment of the butterflies, ...

Monarch butterflies down 26% in Mexico wintering grounds

The number of monarch butterflies that showed up at their winter resting grounds in central Mexico decreased by about 26% this year, and four times as many trees were lost to illegal logging, drought and other causes, making ...

Lessons from cities that plan for their rivers

In Nairobi, Kenya, the government is destroying buildings constructed on riparian land in a bid to mitigate the impact of floods. This is just one example of a growing African city that hasn't adequately protected its rivers. ...

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