I've read about some scientific theories that postulate a trigger for planetary ice-ages is, in fact, a continent drifting across one of the poles... creating a run-away effect of increasing the albedo of the planet. One possible consequence of these theories is that we are currently smack in the middle of one of these ice-age phases - and that the "normal" state of the globe is, in fact, very little or NO ice... anywhere on the entire planet... with possibly a few seasonal exceptions in extreme locations.
The point is, the Earth will do what the Earth will do - and there is nothing we can do to stop it or change it. As any kind of Earth-science should teach us - change is the only constant in this world... Look at the fossil record! How many thousands of species lived and passed away? I live a thousand miles from the nearest ocean - yet there are fossils of sea-creatures here! Things change. And the factors that govern our climate are HUGELY more complex than than our politicians and their useful idiots are prepared to accept. Yes, we humans could wipe ourselves out someday - but its not going to happen by using the natural resources given unto us by mother nature herself to survive.
Venice, Italy has been inhabited for well over a thousand years... slowly sinking into the sea... and people still live there. Rest assured, the future inhabitants of the shoreline (where ever it may be) will likely be toiling away, trying to make a living, much as we are today - and have been for thousands of years. Don't panic.