When did man-made acid rain first become a problem?

First identified in 1872 in Sweden

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck