Sure we do. Remember when the ozone layer had a massive hole in because of CFC use in refrigerators? It didn't fix itself out of some natural law of the world. Regulators in democratic societies restricted the use of CFCs and then engineers worked on alternatives due to the regulations.

We should also not forget that a lot of effort has gone into decarbonising, and there's plenty of work going on in international cooperation, engineering, urban planning, education etc. whose work has already decreased the potential warming of the planet. We're still on a very bad trajectory that still needs more work, and there are moneyed organisations trying to stop the transition, but we shouldn't be so doomer to believe that nothing is happening.

Or: humans do have that capacity, but our system is explicitly set up to give the most power to the greediest among us, and these greedy people in power don't have that capacity.