Scientists have already told us this OP. The federal government already knows, we just have to elect politicians who will pay attention. The Defense Department is already planning for sea rise, it was in the news this week.
The federal government is just trying to restore democracy at this point, and try not to let it's more ignorant citizens accidentally kill themselves by believing in antivax propaganda and destabilize the country.
It's up to the rest of us to help the environment.
https://eos.org/features/a-50-year-old-global-warming-forecast-that-still-holds-up
https://interestingengineering.com/mit-predicted-the-collapse-of-todays-society-in-1972-and-were-still-on-track
"A new study by a director of one of the world's largest accounting firms, KPMG, reveals that a 1972 model by MIT researchers predicting the collapse of society in the 21st century looks to be worryingly on track, a report by Vice explains.
The 1972 model, called World3, was created in the '70s using empirical data, and it was published in a book called 'Limits to Growth'.
Essentially, the model aimed to answer the question of what would happen if humanity keeps pursuing economic growth, no matter the societal and environmental cost? It concluded that, without drastic change, industrial society was headed for collapse." We are right on track, according to the 1972 study.