said by pleekmo :

I hate to tell you this, but the logic of the situation is this:

The best belief of many (most) of the world's scientists is that at current levels of increase in carbon dioxide the Earth will soon experience a runaway moist greenhouse (that is, the Earth would end up with a climate similar to Venus'), after which THERE WOULD BE ABSOLUTELY NOTHING WE COULD DO TO STOP IT.

So the point of the matter is that we can act now to ensure by reducing our greenhouse emissions to a safe level that we do not reach this point. I repeat, after we reach the point of runaway greenhouse there will be absolutely nothing we could do about it.

We can act now to make sure we never have this happen or we can do nothing and possibly extinquish most, if not all, life from Earth.

Are you willing to bet that we will not reach a runaway greenhouse or are you willing to do something to make certain that it never happens?