>> It would not occur if poor countries had proper waste disposal infrastructure (ie collection and landfills).

Sure, and if we just provide food for everyone then nobody will be hungry.

That's some high quality hand waving there my friend. The whole "don't worry, we'll figure it out" attitude just comes across as useless. There aren't realistic solutions in place right now. People are working on solutions though. This doesn't mean that there's any reason to assume these solutions would work on a global scale.

When dealing with problems like this, we're going to require extraordinary solutions. Confusing "possible" and "probable" is my issue here.