Benson
Registered Senior Member
"Allowed to?" No one - other than us - will stop it. We could utterly destroy this planet in half a dozen ways.
It's like asking if you are "allowed to" smoke, drink Sterno or cut off your own hands. Yes, you are. But it's a really bad idea.
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?