"Hey clem! Why don't we change the climate of your terrarium so it's different than it was this morning?"

"Damnit, Cletus! That'd be like puttin' all that life on a whole new planet! There's a reason I have all these sensors and meters and shit! The climate is what makes the terrarium a place where the stuff inside can survive!"

The earth's climate IS what makes this planet habitable for all the species that live on it. If you change that climate over the geologic equivalent of a finger snap in time, nothing survives. Might as well be peeling the rind of life off the earth.