So, when it reached 3,000ppm in the past, the planet need mankind to stop it? If you're saying 3,000ppm destroys the planet, why is life still here? Why can't it reach 3,000ppm again? Which authority claims it's not allowed to do so again?
...but a chance for another plug for "quorum-sensing", "hive minds" and shit, nevertheless. Please Register or Log in to view the hidden image!
Why do these guys persist in posting irrelevant noise? For the fiftieth time: the threat is from the high rate of change in the CO2 concentration, which leads to a high rate of change in the global climate, in the acidity of the ocean, and in a couple of other factors. AGW is about ten times as fast as global climate changes of the past. That's how it kills.
Yes, all the Pope has to do is wave his hands around in some arbitrary gesture and mumble Latin gibberish like usual, and it'll happen just as surely as every other miracle he's ever created. No need to worry about being a responsible sensible human being, he'll take care of everything for ya.
A few billion still do, no idea whether you count yourself as one of them. If not the Pope, then who were you expecting to alter the sun's intensity? Captain Kirk?
It's possible, yes. For example, construct an Earth-sized, single molecule thickness solar shade at L1. Needless to say it would be VERY hard to do.
as/re Will global warming be reversed by human's effort? The human component of climate change is within our control and Only the human component of climate change is within our control. Ignoring that which is not within our control is folly.
That is the point exactly and scientists are well aware of that. That's what scientists are warning us about, the climate change that we are causing, the one in which we have control. Natural climate change is not an issue at this time.