New York Times: Cuba is a priceless ecological resource. That is why many scientists are worried about what will become of it after Fidel Castro and his associates leave power and, as is anticipated, the U.S. government relaxes or ends its embargo. The island, at the confluence of the Atlantic Ocean, the Gulf of Mexico and the Caribbean, has mountains, forests, swamps, coasts and marine areas rich in plants and animals. And since the imposition of the embargo in 1962, and with the collapse in …