Every year, humans use a trillion single-use plastic bags, nearly 2 million each minute. When they are discarded, they pollute our lands and rivers and take up to one thousand years to decompose. In Bali, plastic bag pollution was such a problem that two young sisters, Melati and Isabel Wijsen, created the youth-driven initiative Bye Bye Plastic Bags in 2013 to ban plastic bags in Bali. Through petitions, beach cleanups and even a hunger strike, they convinced Governor Pastika to commit to a plastic bag-free Bali by 2018. Photo credit: EcoWatch