Why is this a problem?

All the plastic that is thrown away will eventually
collect in a big pile. Here it will slowly break appart
in extremely small micro-plastics. At this point
the problem starts. The little plastic parts will be eaten
by animals. Many will die, but some will survive.
These might get eaten and this way, we without knowing
eat micro-plastics. Besides this all the plastic
leaves behind a massive carbon footprint.
This is the main reason of climate change.