Here are some of the biggest potential costs of failing to act against global warming, according to a new study:

• $950 billion in increased water costs, mainly in the Southeast and West, because of increasing drought conditions

• $422 billion in damage in Atlantic and Gulf Coast states, resulting from more intense hurricanes

• $360 billion in real-estate losses, mainly in the Southeast, because of rising sea levels

• $141 billion in increased energy costs, mainly for air conditioning in Southern states, because of higher temperatures

Sources: Natural Resources Defense Council, Tufts University