250 organizations such as PepsiCo, Unilever, and H&M have made a pledge to fight plastic waste and work with governments in order to increase recycling; from just 23 left at the turn of the 20th century, bisons are ready to return to their home once agains; and students created bio-bricks out of sand, bacteria, and urine, disposing of waste while also drastically reducing the energy and pollution required for the production of regular bricks.