One major problem with today's economy is that the resources flowing through it only go in one direction - from extraction to production and consumption, and to disposal.
An alternative to this hugely wasteful linear system could be a 'circular economy' - the subject of this week's 'How it Works' animation.
earthrise airs each week at the following times GMT: Friday: 1930; Saturday: 1430; Sunday: 0430; Monday: 0830.
Click here for more on earthrise.
Source: Al Jazeera