'This is why we must “guide the biologic future.” After all, if we don't, who will? We must keep the Earth as she is, in pristine purity, because however she is now (or was, just before the Industrial Revolution), is how she always was and always must be. Forgot those other tipping points: they're in the past. The Earth of 1890, or 1850, or whatever, is our goal. Those climates are not in the past. They're our future, as long as we act now'