It&#x27;s very important to account for indirect costs too.<p>- Harmful emissions killing thousands [1]<p>- Degradation of environment such as water contamination.<p>- Geo-political implications.<p>[1] - <a href="http:&#x2F;&#x2F;www.ehhi.org&#x2F;reports&#x2F;exhaust&#x2F;summary.shtml" rel="nofollow">http:&#x2F;&#x2F;www.ehhi.org&#x2F;reports&#x2F;exhaust&#x2F;summary.shtml</a>