Want to reduce fossil fuel usage? It'll only happen when cleaner alternatives are cheaper.
Climate change? Nothing will change here until there's an economic reason for carbon sequestration.
This may seem depressing but there's an important lesson here: any sense of urgency is almost always overblown. Things really do have a way of resolving themselves.
Oh and as for space debris, yes it's a problem but space is also really big. Like the US also put a bunch of copper up in space [1] that's still there.
How could this resolve itself? It'll end up resolving itself when launch costs are sufficiently cheap. We've made a ton of progress in the last few decades. IIRC SpaceX cost of getting payloads into LEO is like 20x cheaper than 20 years ago but it's still north of $1000/kg.
But what does the situation look like when the cost gets below $10/kg? That's not as unrealistic as you may think. A lot of attention is given to space elevators. I think these are likely infeasible (eg they rely on discovering a sufficiently strong material that doesn't exist yet).
But orbital rings [2]? These require no magical material and would be completely game-changing. If you have something like that just hang things off them to pick up passing space debris.