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The Port of Houston, in Texas, is the biggest international port in the US. It's also extremely vulnerable to big storms and rising sea levels, and climate change is only predicted to make those worse. That's where Houston has a problem— the fortunes of the city are very closely tied to the oil industry.
Photo: The Houston Ship Channel stretches 52 miles from the Gulf of Mexico to the city of Houston. Sea levels have risen 2.2 feet over the last century at Galveston, the main barrier island protecting the Ship Channel from a big storm. Credit: James Dillard/United States Coast Guard