A new threat is here, and scientists say there's no way to stop it, as even remote parts of the world are seeing microplastic ...

The air was so laden with pollution from coal power plants and cars at the time that it turned the rain toxic. Downpours killed fish, destroyed forests, eroded statues, and damaged buildings, sparking ...

Erosion transports the fragments away ... forming an acidic concoction that dissolves rock. For example, acid rain dissolves limestone to form karst, a type of terrain filled with fissures ...