It's a Wonderful Life #7

This is one that we all definitely take for granted:

7. The modern automobile
"Granted, cars emit greenhouse gases and create maddening traffic jams, but consider what else they do. Compared with the models on the road in 1970, today's cars burn less gasoline per mile and emit 98 percent fewer pollutants. That's why, despite the doubling of the number of cars, there's much less smog in the air.
The basic sedan today offers more creature comforts and safety than the luxury cars of old. The fatality rate has declined sharply, and cars have become so reliable that it's rare to come upon that once-routine sights on the shoulder of the road: a driver forlornly staring under the hood."