Indigenous Humans (and also present humans) have massively shaped the ecology and climate of this planet to its benefit (and our detriment). See forest gardens in the pacific northwest as an example.

That suggests the forest gardens were not only deliberately cultivated by Indigenous gardeners, but also remained resilient in the face of dominant local flora long after people left the scene, the researchers report today in Ecology and Society. The mix of different species was probably key to their persistence, Miller says: “There’s less open niche space, so it’s harder for new species to come in.”...Other researchers say the findings could help boost the case that Indigenous knowledge has an important place in conservation efforts. “Anthropologists and archaeologists have been arguing in favor of this, but there’s been a lot of resistance from ecologists over the past 20 years,” says Patrick Roberts, an archaeologist at the Max Planck Institute for the Science of Human History who was not involved in the research. This study, he says, is an important piece of evidence showing human modification can add value to ecosystems.

There is nothing stopping us from consciously designing future cities in and around forest gardens. Reforesting the amazon. And finding ways to reverse acidification in the oceans. But that's not profitable nor valuable right now.