I always think this is a great opportunity for AI and Robotics. Sorting recycling automatically would be a huge improvement.
Edit: I know you are not supposed to ask about downvotes but I have no idea why this got downvoted. This would finally be an application of AI that benefits mankind instead of more surveillance for ads.
I didn't down vote you, but I do know that some robotics is used now. In addition with different sized mesh screens to filter size. Then they use float/sink and melting point to further separate.
Edit: I know you are not supposed to ask about downvotes but I have no idea why this got downvoted. This would finally be an application of AI that benefits mankind instead of more surveillance for ads.