Well turning the desert green may have an impact on the global ecosystem of the planet at least as far as local species go. If that isn’t a problem for you the

Well turning the desert green may have an impact on the global ecosystem of the planet at least as far as local species go. If that isn’t a problem for you then sure go a head. Mars would require us to solves many more problems which can be then used to solve problems here on earth sometimes a bigger challenge is required to push for a breakthrough. But if we go about geoegineering then I rather terraform mars which by all accounts is a dead planet than terraform the less livable places on earth as they are a host to their unique life forms.