Pollution

Scientists unmask the toxic villain behind London's 'killer fog'

Don't underestimate the life-saving power of urban trees

11 ways to get clean air without chemicals

A little help here? Mark the rhino gets tire stuck on his horn

What is the Great Pacific Ocean Garbage Patch?

Why Paris is transforming a riverside highway into a pedestrian promenade

Trash-devouring 'sharks' patrol the Port of Rotterdam

What are chemtrails, and are they dangerous?

Amsterdam birdhouses distribute free Wi-Fi when air pollution levels are down

Going green when it's your time to go

Octopus finds ocean floor home in flip-flop

Insect threatens to turn the Taj Mahal green

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