In Western economies, more energy is used to operate buildings than to operate transportation. ████ ██ ███ ███████ ██ ██████ ███████████ █████ ███ ███ ██████ ██ ████ ██ ███ ██ ████ █████████ ███ ██ ██████ ██ █████ ███ ████████ ███ ████████ █████████████ █████ ████ █████████ ████████ ███ ███████████ ███████ ████ ██████████ ████ ███ ████████ ██ ███████ ████ ██████ █████ ██ ███ █████ █████ ██████ ███████ ████ █████ ████████████ ████ ███████ ███████ ███████ ███ ████ ██████ ██ ███ ████████ ████ ██ ██ ███ █████ ████ ███ ████ ████ ████ ████ ████ ████ ███████ ███ ████ ███████████ ██ ███████ █████████
50 to 100 years from now, technology will save more than $200 billion per year, because it currently saves several billion per year.
The author establishes a current savings, and then concludes that there will be more savings in the future. She is assuming that the savings rate will increase over the next 50 to 100 years. There are many ways that this assumption could take form, but generally, we need to know that there won’t be anything preventing that increase from happening.
On which one of the █████████ ███████████ ████ ███ ████████ █████
Technology used to ████ █████████ ██████ █████████ ████ ███ ██████ █████████████ █████████ ████ ███ ████ ████████
Another oil crisis ████ █████ ██ ███ ████ ██ ██ ███ ██████
Buildings will gradually ██████ █ ████ █████████ ████████ ██ ██████ ████ ███████████████
Energy bills in ███ ████ ████ ██ ████ ███████ █████ ██ ███ ████ ██ ██ ███ ██████
Energy-efficient technologies based ██ ███ ██████████ ██████████ ████ ██ ██████████ ██ ███ ████ ██ ██ ███ ██████