The Earth has feedback mechanisms to keep things cozy.
Yeah but these feedback mechanisms have serious consequences as well.
The oceans are becoming warmer and more acidic because they are absorbing some of the excess CO2 in the atmosphere. https://en.wikipedia.org/wiki/Ocean_acidification
The warmer oceans are causing some species to die off http://news.discovery.com/earth/oceans/unusual-warming-kills-gulf-of-maine-cod-151029.htm
And we don't know what all of these feedback mechanisms are going to be and what their consequences are going to be either. But if we start having mass die-offs of phytoplankton, most animals will die off including us.
Earth's feedback mechanisms, are made to cope with temperature change over tens of thousands of years, not in a century or two. So either we can change now to help stabilize this change before it gets really bad or we can just sit back and watch it happen and continually adapt to all of the changes, while we kill off a lot of different species and alter the planet completely.