The water is a source of global warming, a concern the US Geological Survey has linked to rising sea levels and a changing climate.

Some rivers, like the Mississippi, have been particularly hard hit by flooding and rising sea temperatures, including a major drought in the Midwest this summer that killed nearly 1,000 people.

But scientists are still trying to determine how to prevent more floods.

The latest report from the USGS, released on Monday, looked at the impacts of climate change in the United States.

The agency said the most affected rivers in the country are in the Gulf of Mexico, the Mississippi and the Missouri.

In the Midwest, the worst-hit region, there were more than 30 river floods, the most severe of which killed more than 2,300 people.

The report, based on research by the US National Science Foundation, said rising sea surface temperatures and the increasing use of hydraulic fracturing for natural gas, could make some rivers more vulnerable to flooding.

A study from the University of Wisconsin-Madison last year estimated the US has a “significant” risk of flooding due to climate change.

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