Stung has a lot to do with bees. A lot. In Stung, the big problem is that bees are pretty much extinct. With no Bees, there would be no plants. Almost all of pollination is by bees, and you need pollination in order to have plants. Most humans use pesticides in their yard, and that definitely does affect bees in harmful ways. Pesticides and lawn sprays are made to kill unwanted plants so that peoples yards look "pretty". This isn't  at all pretty to the bees. Bees rely on these plants to help collect nectar. And if Bees do not collect nectar, they do not spread pollen, which helps plants grow. A couple plants may not seem like a world wide crisis, but it is. When plants die, animals die, when animals die, humans die.