Energy efficiency can save the world — if we can figure out how to pay for it

According to a new International Energy Agency (IEA) report, improvements in efficiency by 2040 could allow the world to double the value of the energy it uses today.

But digging into the report, advocacy groups find the rate of improvement is slowing. The American Council for an Energy-Efficient Economy points out global energy intensity fell by 2.5% in 2011, but the rate of improvement slowed to 1.7% in 2017 — and absent gains in China, the decline could have been worse.