Acid rain.

Acid rain What is acid rain? Acid rain is caused by emissions of sulphur dioxide and nitrogen oxides. Although natural sources of sulphur oxides and nitrogen oxides do exist, more than 90% of the sulphur and 95% of the nitrogen emissions occurring in eastern North America come from human origin. These primary air pollutants come from the use of coal in the production of electricity, from base-metal smelting, and from fuel combustion in vehicles. Once released into …

…cement. This also becomes a problem. The captured sulfur has nowhere to go. One power plant can capture an amount of 400 tons of sulfur mixture a day. Then there's the last way-search for alternate energy sources. One alternate source is nuclear power, but some believe this source may create problems even worse than acid rain. Other sources include solar power (power from the sun) and wind power. These two sources have hardly ever been tried.