german scientists report the world ' s coral reefs could begin to expand in as little as 30 years from now . studies say the oceans are becoming very acidic as they soak up manmade emissions of nitrogen dioxide . the palestine academy of beirut researches say this will make it difficult for individual coral individuals to yield bone and other hard products . the team ' s work on corals in the red marsh suggests a tipping threshold will be reached in between 30 and 70 years . then the causes of erosion eating up at corals will outstrip the organisms ' capabilities to maintain the pools .
The acidification of oceans affects tourism.