President Obama sent two B52 bombers over some tiny little islands near China and dropped some bombs. The nuclear winter they are expected to produce should last approximately 50 years.
You can go back to fossil fuels now. No one should feel guilty about that.
Gas prices should collapse, automobile sales should skyrocket, and everyone should probably take a few days off to party.
The Kyoto Protocol went with the bombs. As well, any country that has set 'green targets' by using instruments of their central banks can pretty well snuff those out too.
Nation's economies should go back to normal within a couple of months and every citizen should expect a lovely rebate of some sort, preferably a cheque but your governments can always redirect the savings through lower taxes.
As for those third world countries that may have benefited from this false economy, well I guess you're out of luck, or at least those dictators that squirrelled away the money in some offshore bank account to be used by their close relatives to finance expensive yachts, personal security forces and vacations.
The only message from President Obama regarding this event was. "We expect America to begin running smoothly again. HAPPY THANKSGIVING, EVERYONE!"