Policy and regulation are indeed extremely important, at least as much as engineering. Implementing a carbon tax would probably be the single most effective thing we can do.
However, I do not agree that climate change is no longer an engineering/science issue: Even if we were to magically stop emitting any GHG tomorrow, we would still be in for a pretty rough time (albeit much better than our current trajectory). And realistically, even with the best imaginable policies in place everywhere around the world we will still need to emit GHGs for decades no matter what. Developing carbon removal technologies is absolutely essential to solve this problem.
However, I do not agree that climate change is no longer an engineering/science issue: Even if we were to magically stop emitting any GHG tomorrow, we would still be in for a pretty rough time (albeit much better than our current trajectory). And realistically, even with the best imaginable policies in place everywhere around the world we will still need to emit GHGs for decades no matter what. Developing carbon removal technologies is absolutely essential to solve this problem.