Of the population, 15.7% live in a semi-arid/ steppe climate (BS), 9.1% live in a arid/ desert climate (BW), 6.2% live in a temperate/ mesothermal climate with significant precipitation in all seasons (Cf), 53.2% live in a temperate/ mesothermal climate with dry summers (Cs), 0% live in a polar climate (E), 15.8% live in a alpine/ highland climate ( ...
Gasoline is also an extremely flammable fuel, and one that does not escape like hydrogen.. The hydrogen fuel cell tanks in the Toyota Mirai are pressurized up to 10,000 psi, and hydrogen is 16 times lighter than air.
Actually, hydrogen is the only gas that is lighter than helium. However, it has a very big disadvantage: It is highly flammable. On the other hand, helium is almost completely inert-this is why it is very much safer to use the latter. What might happen when you use hydrogen instead of helium was impressively proven by history when the Hindenburg zeppelin exploded on 6 May 1937. There is video footage, that can be seen on youtube.