Washington Post: Climate change and overfishing, rather than pollution, are primarily responsible for killing off coral reefs in the Caribbean, according to a new study. The paper, by researchers from the Wildlife Conservation Society, Columbia University and the University of Maryland, examined the effects of two of the most common pollutants: phosphorus and nitrogen. They concluded that nitrogen is the more damaging of the two, but its effects are mostly felt after a reef is dead or dying, because …