It is highlighting life along the River Severn, from its source in Wales to the Bristol Channel.
When you think of the world's longest rivers, some of your first thoughts might be the Amazon and Nile rivers. The Nile River spans 4,132 miles, and it is considered the longest river in the world.
Seeing a toxic blue-green algae bloom in the St. Johns River has become more common as more pollution flows into the river from toxic sewage sludge. (Photo via the St. Johns RIverkeeper) What is it ...
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