The allocative efficiency of the market is not harmed by such rules as long as they apply equally to all participants. Of course, those who produce under these rules should not be forced to compete with others who are not so restricted. Each market should be protected from outside competition to the extent necessary. There is no harm in trade when the trade involved is not essential to local survival. Such trade is truly voluntary and mutually beneficial.
Countries trade on terms laid down by others on pain of starvation.
Planetism would have none of that. Planetism's goal of self-sufficiency includes the field of energy. A planetist society would price imported energy high so as to provide maximum incentive for the market to engender the urgently needed changes. The first step would be shifting to highly energy efficient equipment to reduce the need for imported fossil fuels. The third step would be building homes, offices, and even whole cities that meet their energy requirements from direct solar energy alone.