ratcheting down every year until it reaches 74 grams per mile (46 grams/km)

The time for wrangling about the exact levels of emissions limits is past. The limit should be zero. Actual zero, not “zero emissions” where zero is defined as some non-zero amount that’s substantially less than average.

“But what about the economy?” I am asked. If this marvellous, stable, infinitely ingenious economy is worth saving, then it will find a way to adapt efficiently to the change.