Miles of forest and thousands of lakes across Northern America and Europe are dying. Rain as strong as vinegar, acid rain is falling across vast areas of wilderness. In Sweden, 4000 lakes   are too acidic for fish to survive. In Vermont, New Hampshire and New York state, 60% of high elevation red spruce are dead. The cause is often hundreds of miles away in our power stations and cars. When we burn oil and coal, waste gases are produced. These emissions combine with water in the atmosphere to create sulphuric and nitric acid which falls to the ground as acid rain. In the 1980's, world leaders agreed to target for reducing emissions of these polluting gases. As a direct result, scrubbers are now being fitted to many power stations despite their cost and all new cars in Europe and the US must be fitted with catalytic converters.