Like what exactly? Global warming is a natural phenomena that we can't do shit about.
Development of alternative fuel sources. Development of more efficient combustion engines.
Also, lower obesity, all those obese burger eating americans, kebab eating brits and sausage eating germans require more energy from the vehicles to propel them.
I don't have the sums infront of me, but if the obesity epidemic was solved, less energy would be required to transport those fat fuckers, meaning less harmful emissions. Kill em all I say, along with the muzzies, feed them to africans or something.
I just pictured Tony Blair saying:
"Global warming is a natural phenomena that we can't do shit about"