And the ending of the ice age was a bad thing??? Humanity would not be where it is today if north america was still frozen. And it was only 12000 years ago. Even if humans help tip things some, what difference does it make? there are so many parts of the equation its just as much fate and the flip of a coin. Nature doesnt have a brain and decide what is best for specific life forms on earth and change the weather for them. The suns energy output is probably the biggest contributer to global change. We will never control that.
The basic premise, long since elevated to the status of a religion, and hence an exercise for philosophers, the idle and the unproductive, is that the earth is a closed static system, and that everyone's climate everywhere on earth, should be the same year after century after milenium, every season the product of the same cosmic cookie cutter...
Everybody who believes this, raise your hand.