The government will not shutdown a company for polluting, they just regulate it.  I have worked with oil/chemical companies for many years.  The government allows so much pollution and if you have a spill or go over that it is usually just a small fine.  Of course disaster like Exxon Valdez are a different story, but the extra pollution on a day to day is easily allowed.

I can tell you 1 chemical plant can easily use well over 88.9MW of power just 1, some of the large data centers have 100MW.

88.9MW for an entire planet of BTC mining is nothing in comparison to other industries or even a single facility.  I would say by your math you just proved BTC is more eco friendly then stuff we use everyday.

Edit: I found this after the fact. Chemical Companies alone back in 2002 use 3.7 Quadriillion BTUs of energy or converted 1,172,284,280 MW. http://www.eia.gov/consumption/manufacturing/briefs/chemical/