The year is 2016, outside a busy supermarket in Nairobi. Shoppers flow in and out carrying their groceries and other goods with plastic carrier bags. That was the order of the day then and plastic pollution had a devastating effect on the environment. A year later in 2017, the government banned production, sale and use of plastics carrier bags. The ban, considered to be one of the sternest in the world, now has a success rate of approximately 80 per cent.