Reduce, reuse - and recycle.
The last of the "three Rs," recycling gives fresh value to the natural resources that are tapped to produce products for consumption. Recycling can benefit the environment by reducing waste - and it's also big business.
Plastic waste is a growing problem in Cameroon, clogging waterways and leading to flooding. The government finally banned disposable plastic bags in 2014. And now, football legend Albert Roger Milla has come up with another innovative way to tackle the problem - by turning used plastic into tiles and paving stones.
How Germany's industrial heartland became a center for environmental projects and Europe's Green Capital 2017, and how residents transformed a trash-strewn Rio slum into an oasis of green development. Plus, an African soccer legend is tackling plastic waste.