Im not sure that landfills are as problematic as you seem to suggest, certainly not in my neck of the woods. Landfills here are responsibly managed, and typically end up becoming nice beautiful self sustaining parks which provide methane based energy to nearby neighborhoods as well as open green spaces for adjacent communities.

In the first world, waste disposal doesn't really pose as much of a problem as people seem to reflexively assume when they hear the word "landfill".

I think the real issue is with things ending up in rivers and eventually the ocean because of irresponsible 3rd world waste management. And in those cases, the very fact that they are 3rd world means they don't care enough about the environment or non plastic single use products or any of those things enough to do anything about it. They're just tryna make a living with the options currently available. Most if not all of these places are impoverished because of anti free market conditions imposed by governments who think silly things like "Hear hear and Ipso Facto- free unregulated markets do not solve all problems" and then they end up making the problems worse, whereas places with free unregulated markets tend to have enough prosperity to spare the time to care about this kinda thing and the money to do something about it.

I can tell you first hand, ccaracas was much MUCH cleaner and better at waste disposal before the socialist revolution than after it.