Twenty-seven African countries have announced or implemented bans on plastic bags, either all of them or the thinnest of them. The bags are blamed for endangering marine life, clogging drainage systems and contributing to greenhouse gases, among other problems. In some countries, including Uganda, enforcement officials stage raids to seize the bags, shaming the ban violators on social media. In Rwanda, bag smugglers are forced to shred the plastic if they’re caught with it at the border. In Cameroon, citizens say the reality of life without plastic bags seems impossible.