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Accelerate: Pump it up

Attracted by cheaper operating costs, taxi drivers find they're also cleaning up one of Latin America's most polluted cities.

Accelerate: The Green Nile

He doesn't know how to read or write and can't access the internet, but mechanic Ahmad Turky still managed to build a motor that engineers have been working for years.

Accelerate: Your car or mine?

Spaniards are giving up their cars and embracing car sharing, in a movement that's spreading around the world.

Accelerate: Pods and ends

A Mexican company has designed a modular, fully automated train that can be upgraded to run on electric and other green engines as they're developed.

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