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Originally Posted by BBKing
The difference is the speed with which human activity can alter the balance of gases and ice and water around the Earth.
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The article isn't talking about speed though, its about distance: "point of no return".
As TW2001 correctly pointed out this planet has gone through phases of heating and cooling far, far more extreme than now - our temperature and climate is extremely mild considering how it used to be. If global warming has now gone so far in a mild climatic state, that it will never cool again, then how exactly did it cool before?
Anyway, AFAIK, scientists still can't make up their minds wether we are going to melt to death, or freeze to death in an ice age, so at least until then, I m not going to go paranoid about what "may", "might" and "could" happen. Almost anything could happen, should we be paranoid about all those senarios too?
Once again, more guess work, supposition being masqueraded as a serious scientific report. Anyone can make random guesses without any conviction they will be fulfilled.