What does Trump's revocation of California's vehicle emission waiver mean for the federal Phase 2 GHG emission rules already in place for commercial vehicles? Commentary by Executive Editor David Cullen.
Ultra Clean Diesel Offers Even Lower Emissions
REG Ultra Clean Diesel — a blend of renewable diesel and biodiesel — is now available for bulk purchase near Portland, Ore. It emits fewer emissions than conventional diesel, renewable diesel, or biodiesel.