Maria Gallucci

Clean shipping advocates plan to spotlight the sector’s emissions at the United Nations Climate Change Conference, which opens today in Bonn, Germany. Known as COP23, the gathering marks two years since the world agreed in Paris on a landmark climate accord — one that the Trump administration plans to abandon. The agreement, however, excluded pollution from international shipping and aviation in its targets to limit global warming. Officials had argued that those industries don’t easily fit into national or regional emissions schemes — and so they were left to regulate themselves.

Every state can create clean energy funds, or CEFs, which are typically supported by a small surcharge on monthly electricity bills. So far 22 states have done so, generating $2.7 billion overall for the clean technology sector during the past decade. Most have used the money to install tens of thousands of solar panel arrays, wind turbines and biomass facilities.