The real danger for our entire civilization comes not from slow climate changes, but from overheating the planetary interior.
Polar ice caps melt not because the air there is warmer than 0 deg Celsius, but because they are overheated from underneath. Volcanoes become active and erupt violently not because the Earth's interior "crystallizes", but because the planetary interior is a source of heat that needs COOLING.
If you doubt whether a planet can explode - you need to see a witness report of a planetary explosion in our Solar system. Plato (428-348 BC) reported that the explosion of the planet Phaeton had been perceived by our ancestors on Earth to be as bright as lightning...
Watch a lecture on earth's interior with Dr. Tom Chalko, explaining the features of the planetary core and the dangers of overheating our planet: