LONDON – The United States has withdrawn from talks in London looking at advancing decarbonisation in the shipping sector and Washington will consider “reciprocal measures” to offset any fees charged to U.S. ships, a diplomatic note said. Delegates are at the UN shipping agency’s headquarters this week for negotiations over decarbonisation measures, aimed at enabling the global shipping industry to reach net zero by “around 2050″. …”The U.S. rejects any and all efforts to impose economic measures against its ships based on GHG emissions or fuel choice,” according to a diplomatic demarche sent to ambassadors by the United States. …”Should such a blatantly unfair measure go forward, our government will consider reciprocal measures so as to offset any fees charged to U.S. ships and compensate the American people for any other economic harm from any adopted GHG emissions measures,” the note from Washington said.