There were abundant discussions during the sixties of the nuclear atmospheric tests that damaged the climate, the start of a nuclear winter. After that, it was overpopulation and the threat of "the Chinese", followed by drought in Sahel and energy crisis. Scaring people is a technique as old as societies to retain power.
That climate is fundamentally
cyclic (http://wattsupwiththat.com/2009/12/09/hockey-stick-observed-in-noaa-ice-core-data/) is certain, and that human, animal and vegetal activities have an impact is certain as well, but how much can be and is discussed but it is unfortunate that so little is done to eradicate war, hunger and epidemics, ignorance or poverty, and that so much is done to satisfy greed or vanity.
If temperature and sea level increase with enough certainty, would it not be better anyway to prepare coastal regions to the menace?
Regards,
Luc