Most of all, there are a lot of cities on the coast: for example LA, NY, Lisbon, Sydney, Barcelona, Rio de Janeiro. Those cities have a big population. If the sea level rises, people will have to move away from those cities (and if it rises rapidly, they might die in the flood).
Further, it could contaminate our storages of drinking water (sea water is salty and can't be drunk).
Also, it will mean less land, which also means less land for agriculture.
In a capitalist society, a person pays for what they utilize and pays no taxes.
In a socialist society, a person collectively pays for everything publicly funded through taxes.
These are only the definitions of "pure" capitalism and socialism. Currently, no society has such; they have a mix of the two.
A general government may operate on individuals in cases of general concern, and still be federal. This distinction is with the states, as states, represented by the people of those states.
