I wouldn’t specifically criticize the third world for this issue. It’s a problem we’re all contributing to in different ways. Also, let’s not forget that a lot of first world waste gets shipped off to the third world for “recycling”, some of which inevitably ends up in the waterways and into the ocean.
For instance, one of my favorite pens is from a Japanese company that has consistently resisted making it reusable. Therefore, Japan, known for its cleanliness, indirectly contributes to a significant portion of avoidable waste. Of course, North America has its own equivalent, such as Bic pens. Not to mention the vast amount of wasteful toys. The third world, on the other hand, faces a slightly different challenge, primarily centered around plastic bags, bottles and containers.
On a slight tangent, maybe the real problem is consumption. But good luck taking that up with pro-capitalists!