Europe heat sparks harmful ozone pollution, 'extreme' fire risk

Europe's searing heatwave is generating very high levels of harmful ozone pollution, the region's atmospheric monitoring service warned Tuesday, adding that large areas of western Europe also face "extreme" danger of wildfires.

Study: Humans responsible for over 90% of world's oil slicks

A team of U.S. and Chinese scientists mapping oil pollution across the Earth's oceans has found that more than 90% of chronic oil slicks come from human sources, a much higher proportion than previously estimated.

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