Business Green: London’s deputy mayor Kit Malthouse yesterday unveiled two hydrogen fuel cell-powered Black Cabs as part of the latest efforts to cut carbon emissions and air pollution in the capital. The team behind the project said the installation of the fuel cells meant the two Hackney carriages were indistinguishable from standard black cabs, the only difference being that the vehicles now only emit water vapour from their tail pipes. The pilot project marks the first phase in an …