If we wish our species to survive long-term we might need to educate ourselves so that we behave in less selfish ways. I don’t live in Florida, but I am doing my part in saving it (I love my friends who live there).
While I agree we aren't the nicest species of primate (that title goes to our cousins, the Bonobos), I also believe a lot of our nastiness can be attributed to nurture rather than nature.
My feeling is that any individual is OK with sacrifice as long as they are not unfairly disadvantaged relavitely to their society/neighbours.
For example: i would not be willing to pay more income tax unless this applied for everyone; even if i wanted higher income taxes.