Original sentence: CO2 emissions standards could be applied to conventional vehicles to spur technology development and economical vehicle sizing.Effective urban planning to reduce sprawl would decrease Vehicle Miles Travelled (VMT), lowering emissions from transportation.However, for electric and hydrogen cars, this does depend on the way the required electricity is generated, so these technologies need to be complemented by low-carbon-dioxide sources of electricity.Increased use of public transport can also reduce greenhouse gas emissions per passenger kilometer
Edited sentence: However, this does depend on the way the required electricity is generated, so these technologies need to be complemented by low-carbon-dioxide sources of electricity.More mundanely, CO2 emissions standards may be applied to conventional vehicles, and effective urban planning and public transport can also reduce greenhouse gas emissions per passenger kilometer