Seems like the necessity is simply that the average CO2&#x2F;joule needs to be lower than a car&#x27;s ICEs.<p>It&#x27;s certainly not zero right now, but we&#x27;re up to 11% hydro&#x2F;solar&#x2F;wind[0], so it seems like it likely is clean<i>er</i>, and it&#x27;s getting better at a faster rate than ICEs are.<p>0[] <a href="https:&#x2F;&#x2F;www.eia.gov&#x2F;tools&#x2F;faqs&#x2F;faq.cfm?id=427&amp;t=3" rel="nofollow">https:&#x2F;&#x2F;www.eia.gov&#x2F;tools&#x2F;faqs&#x2F;faq.cfm?id=427&amp;t=3</a>