Fact Check: Rick Perry said carbon dioxide emissions in Texas were down because of "incentive-based regulation" during his time as governor. But the evidence shows a decline in manufacturing jobs and federal energy policies - not the state`s - are more likely to be the cause of the reduction.
Perry pointed to policies that upgraded old diesel engines. But the nitrogen oxide figures he cited actually exclude vehicles, and transportation sector CO2 rose over the time frame in question. The CO2 reduction was...