As an example, large parts of Florida are predicted to become completely submerged by the end of the century. So why don't activists fighting against climate change set up billboards in Miami warning people that their houses are at risk? Similarly it's expected that large parts of New York will go underwater within a few decades, so why not push New Yorkers to fight against climate change by reminding them of the future?
Currently most activism is based around an abstract "2 degrees temperature increase" or "more heat waves" or "bigger hurricanes", which fails to explain the negative effects on specific locations.