Pollution

When is public transport free in Paris? When pollution gets out of hand

World's first polluted river flowed through Jordan 7,000 years ago

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

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