system
Given the following post, respond as if you're commenting on Reddit:
human
Is terraforming a real possibility?

Is terraforming something being worked on to not only clean up earth but also make places like mars hospitable for human life?
gpt
Yes. It may only take about 100 years to increase the temperature and pressure enough to support plant life.  It would take much much longer to get enough oxygen in the air for us to breathe, but we could walk the surface with just a mask for o2.

Edit: added a source below.