Pricing Carbon By ExxonMobil

I found this interesting in the current issue of Bloomberg Businessweek by Mark Hertsgaard - If It's Good Enough For Big Oil . . .

"ExxonMobil's carbon price is invisible to consumers - it's used to help executives test potential long-term investments.  The company projects that governments will impose a price on carbon that reaches $60 a ton in countries that are part of the Organization for Economic Co-operation and Development by 2030 and $80 a ton by 2040; executives ask if a new refinery or pipeline will be profitable decades form now with that additional cost."