In the beginning of the lecture, the professor spent some time on some "key points," or what he hopes will be the take-aways that students will find particularly useful from this set of lecture. Below are a list of ideas, of which three were mentioned in the lecture. Select the three that were mentioned as "key points."

-Both vertically and horizontally, the oil production system tends toward natural monopoly.
-The infrastructure for the extraction, refining, shipping, and retail distribution of gasoline is very old, and very well established
-If we are to replace petroleum, any viable alternatives (Biofuels and alt fuels, etc.) must work within this existing system.