The clean skies tax might even break therules of the UN Framework Convention on Climate Change and the International aviation agreements, according to many nations in the group who are scrambling to find clauses in bilateral agreements and international trade laws that would force Europe to end the carbon tax.
Some rich countries are seeking new rules under the UN climate convention, which campaigners say would allow them to gain credit for "business as usual".
For a bit of extra perspective on the small business regulatory climate to absorb alongside the flow of rules and RFAs, the table below depicts a partial list of the basic, non-sector-specific laws and regulations that affect small business.
With it have gone fears that international environmental agreements like the Kyoto Protocol on climate change could be made subservient to the WTO's rules on trade.
Another issue weighing on Exelon is the question of whether the environmentally friendly generator will reap financial benefits from climate-change rules.