[KarlInOhio]

“If I mow my lawn for one hour,” says Crane, “I’d produce more emissions than if I drove a new car from New York to Los Angeles.”

I smell bull exhaust.

That number keeps on going up and up and up. The author is saying that a mower engine emits about 2000 times as much exhaust / horsepower / hour?

[NVDave]

Not exhaust, but for some very narrowly specified emissions components, yes.