Aviation is also mentioned, which (to me) is a bigger deal here. The only viable alternative to burning jet fuel is to get from A to B much, much more slowly. Which is great and something we should be doing! But realistically…not gonna happen anytime soon.
Take numbers with a grain of salt, e.g., this link says a 7200RPM 160GB SATA drive from 2004 is $107, or about $0.67/GB, instead of the $5 claimed in post.