We are destroying this world in our egoism and nature shows us exactly that. We need to think of the generations that come after us and not leave them a big mess just because we felt too comfortable and were too lazy to clean up and do something different.
Take care to be in harmony with nature. Enjoy nature and be thankful for it. With thankfulness the respect for nature will become your basic attitude and then you will never have the idea to leave your garbage somewhere in a forest or pollute a river. Being in harmony with nature can make you happy.