It takes decades to restore a river
No quick-fix can return a river to its natural state after human intervention. It takes at least 25 years for plants to reconquer the banks of a river or stream.
The Arctic may be a long way from the industrial world, but harmful chemical substances find their way northward and concentrate in animals there. Researchers have now found a disturbing trend: concentrations of one harmful chemical family are higher in thin Arctic foxes than in their more well-fed brethern.