wireless charging

https://www.resilience.org/stories/2020-08-09/wireless-charging-a-colossal-waste-of-energy/

... wireless charging expend up to 47 percent more energy to charge [...] phones [than wired]

I have to confess I'm guilty.  Support for wireless charging was a major consideration in my last phone purchase.  Or more accurately, I specifically didn't buy the pixel 3 as it had no wireless charging.  

The convenience of "dropping it on the pad to charge" is great.  Given that the charging coils are so close to the phone I'd expect the efficiency to be fairly good.