Oy vey.

From a recent Dish:

Hilary Duff is banning confetti use from all of her future concerts, after learning it's bad for the environment during one of her online classes.

During her environmental science class on Harvard online the singer learned that the use of excess paper has a negative impact on nature -- and she's already changing her ways.

She tells MTV News, "It's so weird now how much I conserve. I turn the lights out, and no more confetti, because that's not recyclable. I did the math for the amount we used, multiplied by 36 shows? We don't need it."

While the teen star is struggling to juggle her busy schedule and read 50 pages of work three times a week, Duff -- who has also learned about the ozone layer and waste management -- enthuses, "It's so fun!"