Make the planet Mars habitable like on Earth
In any case, the terraforming system of the Red Planet would bring the temperature and pressure levels above the point where humans could walk on the surface without a spacesuit. And most importantly, without seeing blood boil in their bodies.
Jim Green mentions his plan to terraform Mars could allow humans to start growing plants on Mars and have the opportunity to live long-term away from Earth. He has a passion for finding life on other planets and has proven it on several occasions.
Anyway, it will be a complicated mission to make the earthlings adhere to this project, on the other hand, not everybody is so flexible with ideas on how to terraform (read also: “manipulate”) whole planets. The doubts, however, were not born yesterday and are legitimate.
Earlier in 2018 Lucianne Walkowicz, an astronomer at the Adler Planetarium, argued that we could turn the surface of Mars into an ecological nightmare, given our proven ability to create problems on Earth as well.