During the 1970's people first began to notice the effects of acid rain and to think about how it might be caused.
It is down to us again. Whenever we burn fossil fuels we release waste gases such as carbon dioxide, sulphur dioxide and various oxides of nitrogen. The main sources of these are cars and power stations
Carbon dioxide is the main cause of the greenhouse effect.
Sulphur dioxide and the oxides of nitrogen will mix with rainwater in clouds and form acidic solutions. These then fall as acid rain.
Acid rain has severe effects on the environment and individual ecosystems within it.
The acid rain will kill trees and damage buildings made from limestone.
The water will also make lakes and rivers more acidic. This will kill fish and other aquatic life.
The increased acidity of the water also allows aluminium salts to dissolve more easily. The aluminium ions are very poisonous to fish and birds.
The solution is to basically produce less greenhouse gases.
To do this we well need to use less fossil fuel. This includes our use of materials and power that rely on them.
In addition to this we can reduce the amount released from source, that is to remove the gases before they are released.
To do this, we can build power stations that have acid gas "scrubbers" to remove them from the chimneys. We can also use catalytic converters in our car exhausts which break up the greenhouse gases as they leave our cars.