Manteca is working on a strategy to reduce greenhouse emissions that include carbon dioxide, methane gas, nitrous oxide, and hydrofluorcarbons.It is in response to the state mandated Global Warming Solutions Act of 2006 that requires municipalities to target greenhouse emissions and reduce them back to 1990 levels.Critics contend the law will substantially increase the cost of doing business in California and will chase jobs out of state.That is in addition to new federal Environmental Protection Agency mandates to further reduce emissions in the San Joaquin Valley by nearly 90 percent. The state greenhouse mandate includes all of California while the new federal EPA standards are just for the San Joaquin Valley.San Joaquin Valley Air Pollution Control District representatives told the council in August that what the EPA is seeking is essentially impossible to attain. Potential sanctions for failing to meet new federal air standards include banning new businesses from opening and preventing the expansion of existing businesses, losing all federal highway and federal takeover of the air quality control district.Population in the valley has almost doubled since 1980 while emissions have been slashed by more than 50 percent.