Smithsonian suggests that you do an enormous amount unnecessary of fossil-fueled travel before CO2 causes New York City and Houston to be "swallowed by the sea"

Six Things to Do and Places to See Before Climate Change Swamps the Party | Off the Road

For the polar bear, extinction is the worst possible, and perhaps likely, outcome—while speciation is another...Other cities that could be swallowed by the sea include New York City, Houston, Bangkok and New Orleans.