A relatively ambitious deal to reduce the shipping industry's 3% of global emissions now looks more likely after four days of closed-door talks in London, observers say.The International Maritime Organization (IMO), which oversees the negotiations, said there had been "constructive discussions" and "genuine willingness within the group to make concrete further progress".Em Fenton, senior director at the NGO Opportunity Green who attended the talks last week, said they "demonstrated a strong spirit of solidarity in the face of blatant attempts to undermine the credibility, ambition and equity of a hard-fought multilateral agreement".