Zero Emission Fuel Cell Hybrid Taxi: Carbon-free cab even south of the river

Before taxis can be fitted with fuel-cell units like this one, the infrastructure needs to be in place to support them. There will be six hydrogen-charging stations on London's streets by 2012, which means you could be riding in a zero-emission black cab by the time of the Olympics. A fleet of twenty hybrid cabs is expected to be on the streets by 2012, and all cabs will be emission-free by 2020. Taxi!