system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can we reverse the effects of Global Warming?

With the recent climate talks, I understand that we have to reduce our carbon emissions. But how is it possible to repair the effects of Global Warming, I mean what are we going to do about the millions (or billions?) tons of Carbon Dioxide released into the atmosphere already?
gpt
The only way would be to figure out some technology to remove the *excess anthropogenic* CO2 from from the atmosphere. We would need some sort of atmospheric scrubber or sequestering machine - on a huge massive global scale. A couple of things:

1. We don't have the technology

2. Coordinating something like this on an international scale would be nothing short of a miracle

3. We would need to make sure we don't take out too much CO2 because greenhouse gasses like CO2 keep our Earth comfortably warm. The only difference between a nice Earth and a global-wide frozen wasteland are greenhouse gasses like CO2. So we can just suck all the CO2 out, or we would go too far the other way and we would all freeze to death.

Anyway, such an endeavour is more science fiction and fantasy than reality. The best we can do is reduce our emissions today, take as many data points as we can to create the best climate models possible and then plan and mitigate according to those models. At this point we are locked in for a few degrees warming, its up to us to decide if we would like to remain at these few degrees, or if we would take a more risky move and try for a few degrees more by continuing to emit in the manner that we have in the past.