How plastics effects your environment?

Plastic is a very good/useful/comfortable material as it can be used for producing almost everything (i.e not using wood, ores etc). The problem is that plastic does not rot (or decay). So the amount of plastic we make will be with us for ever transforming the upper layer of soil into rubbish, it pollutes the waters as well, kills animals (see seagulls on the internet after they had eaten plastic bottle caps scattered on the seashore.)