Blue and Green: UN experts have said that reducing emissions from vehicles is possible and less complicated than what previously thought but that a rise in global traffic is expected and governments must act.
A draft UN report seen by BBC News has warned that traffic is set to become the largest source of carbon dioxide (CO2) emissions, as cities will become bigger and more and more people will need to travel and become car-dependent.
Experts said in the report, Without aggressive and sustained policies (to...