Cars and trucks using gasoline and diesel are the single biggest source of human-caused carbon dioxide emissions in California. California has aggressive goals of reducing its carbon emissions by 40% from 1990 levels by 2030, and 80% by 2050. The only way it will do this is by curtailing emissions from cars and trucks.
Clean cars legislation requiring all new passenger vehicle sales to be clean vehicles starting with model-year 2040 vehicles will cause strong and steady reductions in carbon emissions, as clean vehicles replace gas-burning ones, until new gas vehicles are no longer sold at all by 2040.
California electrical energy is going green, as new solar and wind installations replace dirty coal and gas-fired plants with clean, less-expensive power, so most people will soon be able to power their cars with 100% green energy.