Earlier in the month, the world's leaders descended on Copenhagen for the UN's climate change summit in an effort to combat climate change, so we thought this would be a good opportunity to take in a bike ride in the Danish capital.
Officially the world's best cycling city, according to the International Cycling Union, it's a place where 40% of commuters use a bike to get to work. We sent Lars Eriksen to find out out why it's so popular with cyclists.
He'll also be looking at a sustainability scheme set up by Danish company Baisikeli, which recycles dumped bikes and sends them out to Tanzania.
Back in London, we visit In Clear Air We Fly, a sound installation by artist Kaffe Matthews that's powered by bikes. The project aims to highlight the issue of air-pollution and encourage more young people to cycle to school.
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