Put it this way. We have only one earth and we are extremely limited to a certain external conditions like temperature, pressure, atmosphere composition, soil,

Put it this way. We have only one earth and we are extremely limited to a certain external conditions like temperature, pressure, atmosphere composition, soil, water, .... The climate is a non-linear chaotic model and no one really knows where we will end. So what we do to our planet is extremely dangerous, because it looks like, that the change will happen within the next thousand or ten thousand years. This is too short to adapt via evolution no matter in which direction the climate change will go, the living space for us might be very limited then.