Independent (UK): All of the tropical coral reefs in the world will be disintegrating by the end of the century because of the rising acidity of the oceans caused by a build-up of man-made carbon dioxide in the atmosphere, a study has found. Coral reefs start to disintegrate when the acidity of the oceans rises beyond a certain threshold, and this point is likely to be reached before 2100, said Jacob Silverman of the Carnegie Institution of Science in Washington. Carbon dioxide in the air …