Car that runs on air: Peugeot 2008 hybrid.

New Peugeot hybrid doesn't need a battery and 'is greener than its electric rivals'
The Peugeot 2008 Hybrid Air runs on nothing more than air
Current 'green' vehicles combine electric engines with traditional ones
The car has a conventional engine linked to hydraulic air motor and pump
It can provide zero-emissions air power for lower-speed driving in cities
The sports utility vehicle was available from 2016 for around £16,000