Geoengineering: Whether through launching solar shades into space to block sunlight and cool the planet down, pump aerosols into the atmosphere, cloud seeding, or anything else. I think this is where our research should be going. I think it's too late to avoid the worst-case-scenarios of climate change from merely cutting emissions, so more drastic measures to alleviate or even reverse the effects may be necessary. Plus it'll help us with any future colonizing and terraforming of worlds outside of Earth.

Public transport infrastructure to reduce our reliance on cars & planes: While I don't think hyperloops or a transatlantic tunnel are feasible, building tens of thousands of kilometres worth of overground and underground railway routes to interconnect towns and cities with high speed maglev trains is. China have the right idea.

Right to work from home: Remote working reduces our dependency on cars and frees up real estate to address the various housing crises we have.

Right to repair and outlawing planned obsolescence: Should we have to buy a new smartphone every 3 or so years because Apple or Samsung want to maximize profits? Do we care at all about the amount of electronic waste we're producing?

Accelerate our efforts to reverse desertification and plant trillions more trees: If we can turn parts of the Sahel, Gobi Desert and the Australian outback green, that could have a very beneficial effect on the environment.