In 2020 the maximum allowable sulfur limit in marine fuels will be only 0.5 %, compared to 3.5 % now. This will probably lead to pains in the industry, because the world's refineries haven't extended their hydrotreating capacity to desulfurize heavy oils to the correct degree.
There is a FAQ by the IMO to this regulation, but I could not find the real story behind this regulation.
Which countries have pressed for this? How was this tough regulation purely on ecological reasons possible? Was there any deal for the industrializing countries like China & India not to vote against it?