The energy security act of 2007 mandates that cars will become more energy efficient by the year 2020.

true

false

me

Global warming was a major concern some people do not care global warming is fake it is not real the percentage of it happening  is slight 

Answer4 million;

Assuming you're referring to significant figures, none of these answer choices are shown to be zero as significant digits. did you, by chance, forget to add something?