In this May 24, 2013 photo, a man walks in the water 

In this May 24, 2013 photo, a man walks in the water near the remains of a destroyed school along the shore of Havana, Cuba. Even the very existence of climate change may be a matter of political debate on Capitol Hill, but for low-lying Cuba, calculations have spurred systemic action. Cuba’s government has changed course on decades of haphazard coastal development, which threatens sand dunes and mangrove swamps that provide the best natural protection against rising seas. (AP Photo/Franklin Reyes)
Associated Press
In this May 24, 2013 photo, a man walks in the water near the remains of a destroyed school along the shore of Havana, Cuba. Even the very existence of climate change may be a matter of political debate on Capitol Hill, but for low-lying Cuba, calculations have spurred systemic action. Cuba’s government has changed course on decades of haphazard coastal development, which threatens sand dunes and mangrove swamps that provide the best natural protection against rising seas. (AP Photo/Franklin Reyes)
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