A University of San Diego research center study shows passing Proposition 23 would keep California from reaching its target date to reduce greenhouse gas emissions.
Proposition 23 would suspend the California Global Warming Solutions Act until the state's unemployment dropped to 5.5 percent for four consecutive quarters.
The analysis from USD's Energy Policy Initiatives Center (EPIC) shows if the measure passes, the state would miss its 2020 goal to reduce greenhouse gas emissions to 1990 levels.
The study said 14 strategies to reduce emissions account for about half of the reductions.
EPIC Director Scott Anders said they would be suspended under Proposition 23. He said if the measure is adopted, the greenhouse gas emissions law could be suspended for years.
"If 50 percent of your measures to get you to your target are suspended for 10 years, you're not going to get to your target, that's pretty clear," Anders said.
Anders said the analysis is based on available economic forecasts, historical unemployment data and the interpretation of Proposition 23.
He also said if the ballot measure passes it's likely there will be legal challenges about what strategies would be suspended and for how long.