A significant increase in carbon dioxide in the atmosphere, rather than changes to the Earth's orbit, was likely the main cause of global warming that ended the last ice age, a new study has found.
OK, but it wasn't humans that caused the CO2 to rise, so our current CO2 rise is also a natural event - we're just helpless to do anything about it. And, the article says it will take centuries to see all the effects of this CO2 rise. So no worries, lots of time to adapt. Why worry.