If plastic is not properly disposed of, what could be the consequences?

As plastic is non-biodegradable it can lead to following effects :

a) When we throw plastic onto the road, then animals like cow eat the remaining of the food along with the polythene bag which leads to premature death of animals.

b) Drainage pipes get clogged as a result sewer water overflows that leads to bad smell and breeding center for various mosquitoes.

c) The plastic that finds its way to the water can kill aquatic life.

d) Plastic when burned leads to air pollution as it emits very toxic gases.