Undo what Trump did. Almost all. If he actually accomplishes getting troops out of Germany, fine, leave them out.
Coal reregulation first
Reclassify natural areas near national parks as not fair game for carbon extraction. Leave carbon in the ground.
Reclassify the seas as off limits for carbon extraction. Leave carbon in the ground.
Add to the teams of regulators who visit off-shore and on-shore facilities. Find every problem. Investigate. Double bounty to whistle-blowers. If there is to be some extraction, make it safe.
Give citizen groups equipment so that escaping gasses can be found quickly without the vested interests controlling the narrative first and controlling the leaks 2nd.