Actually, a major contributor.
Bees play one of the most important roles in human society, more then we know. If you've ever enjoyed the activity of eating, you should generally thank the bees.
So if you enjoy continued existence, read on! If you don't like it, you're free to leave. Don't let the door hit you on your way out.
Bees are directly linked to over 1/3 of the entire world's food supply; They are responsible for pollination of hundreds of essential food sources in the world. I'm not talking about crackers and cookies, I'm talking the important stuff.
Think about all the things that require pollination; Chances are that the Bees allow hundreds of various foods to be sold at relatively cheap costs. Can't think of any? I'll help you: Almonds, Apples, Blueberries, Watermelons, Cherries, Onions, Beets, Broccoli, Cabbage, Cauliflower, Various Chili Peppers, Tangerine, Coconuts, Hazelnuts, Cucumber, Lemons, Limes, Carrots, Strawberries, Cotton, Walnuts, Sunflowers, Various Beans, Apricots, Plums, Pomegranates, Pears, Black Berries, Sesame, Eggplant, Cocoa, Cranberries, Vanilla, Tomato, and Grapes.