I guess it's a California thing. You have to believe in global warming (In the mid-west we have had 20 degrees below normal now for 3 months and snow of 14 inches in May). My practical side says the Tesla is nice but if fighting CO2 is your aim you could buy a $20K Honda accord and convert it to run on ammonia ( nearest practical gas to hydrogen). Ammonia is already piped all over the midwest and in contrast to grid power is almost all made from domestic natural gas. And with a loan of $450 million like Musk got I could build a home ammonia generator that takes in grid power to generate hydrogen and using nitrogen from the air. The small ammonia reactor is the only thing that needs to be developed (the hydrogen generator and nitrogen from air products are already off the shelf).