(a) the climate is supposed to be changing, and
(b) we're still in the tail end of an ice age - the Earth's temperature is still significantly below the long-term average on the geologic scale - the only scale that matters to the Earth itself.
If the natural progression of the Earth's climate is going to make certain languages go extinct, then maybe you should get off your duff and start recording that language for posterity, rather than trying to stop the Earth from changing naturally.