In the past, refrigeration did not take hold for 20+ years after it was invented due to the tight grip of the ice-houses.
It had nothing to do with "the tight grip of the ice-houses". The first commercially available home refrigerator came onto the market in 1911 (a time when the vast majority of homes did not yet have electricity) and was powered by an external motor (or steam/internal combustion engine) that was often mounted in a different room. The first self contained refrigerator came onto the market in 1923, retailing for $714 ($9,700.30 in 2013). For comparison, the average yearly wage at that time was $1,066. These weren't devices that many people could afford. Mass production didn't really begin until after World War II, reducing the cost and making refrigeration accessible to many more people.
It seems odd how they are trying to go "straight to the road". Seems like they should be having self-driving cars continually running at big businesses such as warehouses, airports, etc delivering materials, etc and see how many accidents they have
Automated fork lifts are already becoming fairly common in larger warehouses and factories. These are actually fairly easy, since you have a controlled environment and areas that can be marked as off-limits to humans. Airports have an *awful* lot going on ramp-side, so it would take a bit more effort to automate the fleet of trucks, tugs, and other service vehicles. I'd wager that self driving cars will be here before significantly automated air ports.
If so, I'm curious: Do you discount all fields of scientific research, or only those that result in conclusions you don't like?
We did evolve with separate holes for food and air. Most mammals are like that. If you don't believe me, watch a dog eat. How can it breathe, when it's chugging down food like that? Because the two functions are separate.
No, if that were true then how would a dog bark, or pant? They couldn't if the lungs did not connect to the mouth. Dogs breathe between gulps of food (or just plain hold their breath), just like you do.
Sure, there are other ways that mining is dirty, but fuel doesn't have to be one of them.