Understanding unity helps to solve humanity's biggest challenges. There is no such thing as an isolated problem. By injuring any part of the world's system, you injure yourself. There is no such thing as a win/lose situation.
Think of life on this planet in terms of systems and not detached elements. Broaden your field of vision and assimilate the knowledge you have. See that the environment does not belong to any single country to exploit and then disregard.
You cannot afford to think of your relationship with the earth as a one-night stand. There's no such thing as a free glass of milk. It's time to buy the cow.