The environmental effects of stopping oil and gas production in Norway are not clear. Norway account for something like 2% of the worlds production. OPEC are already price fixing the market, and could (and propably would) easily replace Norways production. Some reports argue it will even increase emissions due to being replaced by less sustainable produciton.
The developing world is too dependent on oil and gas. Rapid degrowth in global oil and gas production would lead to mass hunger. It is only the developed world who can afford to stop using oil and gas at the moment. We have to replace the worlds energy needs with something else, before we take environmental choices to cut production. Third world countries suffer without cheap oil and gas.