Greenpeace

acid rain is caused by fossel fuel that are traped in the co2 that comes down as rain.this lands on trees and other plants.on some trees the fossal rain comes down and bactria forms on the trees.this causes a mold that feeds off the fossel fuel and keeps the trees from breathing and dryies out the tree.the life of a tree band as it grows is only 1/4 inch and is on the outter edge of a tree just under the bark. MSJR