The international shipping industry is a major greenhouse gas emitter, accounting for about three percent of all greenhouse gas emitted last year. For reference, this is roughly equivalent to the total annual emmissions of Germany.  Because these emissions occur on international waters, the shipping industry was purposefully left out of the 2015 Paris Climate Agreement. Instead, a UN agency called the International Maritime Organization is the forum for multilateral diplomacy to curb emissions in international shipping. In early July members of the IMO met in London for negotiations.   Joining me to discuss why this meeting was so significant to international effots to curb greenhouse gas emissions is Susan Ruffo, Senior Director and Senior Advisor for Ocean and Climate at United Nations Foundation. We kick off discussing the impact of international shipping on climate change and then have an extended conversation about what happened at this meeting of the International Maritime Organization, which includes a new target for emission reduction and progress towards enacting a levy on carbon emissions from shipping.