While most carmakers are trying to water down federal and state mandates to increase the number of zero emission vehicles, Tesla Motors Inc. is pushing for tougher ones, the Los Angeles Times reports. Tesla, which has earned more than $534 million from the sale of environmental credits to competitors, claims California won’t be able to meet Gov. Jerry Brown’s mandate to have 1.5 million electric vehicles on the road by 2025 without tougher standards. Some governmental agencies agree.