What would the EPA proposal really mean for crapcan racing?

Anyone with any sort of interest in amateur automobile competition, be it drag racing, crapcan racing, or Spec Land Yacht, must be aware by now that SEMA has sounded the alarm about some alarming bits from the Environmental Protection Agency’s 629-page proposal with the soporific title “Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium and Heavy-Duty Engines and Vehicles; Phase 2.