What a horrible lie to spread. What you said is hardly the case at all. Scientists have known for many decades that Earth is already beyond its carrying capacity. Multiply that by the fact that our natural ecosystem is collapsing way faster than any estimates, and you get the fact that humanity has NO CHOICE but to establish a self-sufficient colony off Earth as soon as we possibly can. You're in denial about the severity of our situation, but without realizing it you're also not aware of the reality of the problem. CO2 is not the real main cause of global warming; and global warming is just the first step in a series of steps that will result in the destruction of human civilization. I've already got verification of this through lots of research and collaboration with peers and we'll be publishing a paper soon. But completely aside from whether this supposed cataclysm is going to happen in 1 year or 200 years, and given that technology continues to develop and be used, why on Earth wouldn't we ensure our survival by distributing ourselves?
I would apologize for my tone but to be honest it's imperative that you and the the people around you open your eyes to the reality. If not, you will also perish. Would you rather live forever or perish forever? And if someone appears in front of you and says "here is your way to live forever", would you turn away from them or would you try to verify their proof?