Jeremy Shelton’s underwater photos showcase one of the world’s most-threatened ecosystems

This is having an impact on both nature and humans. Freshwater fish provide food for 200 million people and livelihoods for 60 million, the report says — and we depend on river ecosystems for water, sanitation and power.”Rivers are the arteries of our planet,” says South African freshwater conservation biologist and photographer Jeremy Shelton. “They…