“China is speed-fighting pollution,” an expert in Hong Kong says.
More people may soon be able to charge their cars on the go using the road beneath them.
The Ultra Low Emissions Zone is promoting low-carbon mobility 24/7 in the UK's capital.
Last year saw 208,000 new registrations for electric vehicles, more than double the year before.
"The answer was obvious: Minimize the energy consumed and use different types of energy production to begin with."
Aviation produces 2% of manmade CO2 emissions, but we can make planes far more efficient. But not just yet.