![video](https://schools.firstnews.co.uk/wp-content/uploads/sites/3/2022/11/COP27_COLOMBIA_SARA_FIRST-NEWS-VERSION_SHD_CLEAN.jpg)
Bogota in Colombia used to be one of the most polluted cities on Earth, but now they’re working hard to change that. Sara discovers how public transport powered by clean energy is helping to improve the air quality for local residents and reduce carbon emissions.
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