Other threats include acid precipitation and climate change.

Much concern has been expressed that acid precipitation causes a reduction in forest productivity.

Air and water pollution, acid precipitation, climate change and many other environmental problems tend to ignore national borders.

It concludes that if acid precipitation is not reduced, the acidification could spread to some Southern streams.

Its theme is that North Americans must awaken to the degradation of the environment by acid precipitation.

Both compounds have been identified by scientists as important components of acid precipitation.

Meanwhile, scientific evidence of environmental problems caused by the acid precipitation was mounting.

Power plants and factories in Europe emit sulfur dioxide that falls as acid precipitation.

The acid precipitation destroys freshwater life in many lakes.

All agreed that forest decline could not be totally explained by acid precipitation.