Biologist Mohamed Hijri brings to light a farming crisis no one is talking about: We are running out of phosphorus, an essential element that's a key component of DNA and the basis of cellular communication. All roads of this crisis lead back to how we farm — with chemical fertilizers chock-full of the element, which plants are not efficient at absorbing. One solution? Perhaps … a microscopic mushroom. (Filmed at TEDxUdeM.)