The world is suffocating in plastic, but PET is an alternative to single-use plastic. Unisensor has developed sorting machines that can produce 100 percent pure PET flakes from recycled bottles. Could it help to beat the plastic problem?

In the US state of North Dakota, firms and environmental activists are pushing for renewables to counter the oil industry. For Cody Two Bears, a Sioux from the Standing Rock reservation, it's about showing respect for his ancestors and their culture.