This isn't actually true (although there are billions who do, understandably) - a lot of people would be fine with continuing with their level of energy usage. The problem is how to produce that much energy without releasing CO2.
Who said anything about energy usage. People don't care about their energy usage, they only care about what they get from it. Every time we make something more efficient we don't save energy, people just take more.
Maybe influence utility provider prices. Kinda like insurance. If you stay inside some range per month, you'll get bonuses. If you want more, you'll pay a single digit % premium ?
