I'm not an expert on climate change but I do have a Bachelor's in mechanical engineering, which gives me some insight into how a lot of industries work. Pretty much the entire materials industry (I.e. production of metals, polymers ceramics for use in other products) is pretty terrible for the environment, and the solution to fix that isn't as clear cut. Recycling helps but the truth is that pretty much every industry pollutes, and the answer to that pollution is rarely as simple as it is when it comes to clean energy production. What's needed is a fundamental shift in how we produce basically everything, and that costs money, and if we want to do it smoothly, that takes time. We do not have that time, so the conclusion to draw here is that a) we should have started decades ago and b) combating climate change cannot be a set policies set to the side, but should rather be the driving force behind our entire economic vision (see also: the Green New Deal).

I'd also like to point out that helping the rest of the world to achieve the same is a rather significant problem to have as an afterthought.