Economists are really bad at predictions, but their views carry sway over large amounts of capital. Their most recent inaccuracies have been in the energy sector. Clean, renewable, energy is making faster progress than previously predicted.
Renewables have seen faster implementation, more investment, and quite massive technical gains in the past few years. And all of these gains have happened despite the fact that oil is so cheap (in terms of money, not carbon).
Each of these trends — cheaper batteries and cheaper solar electricity — is good on its own, and on the margin will help to reduce our dependence on fossil fuels, with all the geopolitical drawbacks and climate harm they entail. But together, the two cost trends will add up to nothing less than a revolution in the way humankind interacts with the planet and powers civilization.
You see, the two trends reinforce each other. Cheaper batteries mean that cars can switch from gasoline to the electrical grid. But currently, much of the grid is powered by coal. With cheap solar replacing coal at a rapid clip, that will be less and less of an issue. As for solar, its main drawback is intermittency. But with battery costs dropping, innovative manufacturers such as Tesla will be able to make cheap batteries for home electricity use, allowing solar power to run your house 24 hours a day, 365 days a year.