Yes, the planet has been colder, it has been warmer as climate change is a naturally phenomenon. BUT If we keep getting warmer at the rate we're seeing, sea levels will rise and it will affect millions of peoples lives. We've been too slow to react to the problems we've been causing.
If sea level rises were a real near threat, why do banks and financial lenders keep lending money to developers in areas that are predicted to go under water, surely they'd forecast that into their risk assessments?
I remember doomsdayer Al Gore saying by 2014 the ice caps would melt and now look, even Greenlands glaciers are growing