350.org co-founder Bill McKibben announced Monday that more than $6 trillion of endowments and portfolios have now been divested from fossil fuel companies. The new target by 2020, he says, is $10 trillion divested from fossil fuel companies. On Monday, New York City Mayor Bill de Blasio and London Mayor Sadiq Khan published a joint op-ed in The Guardian calling on other cities around the world to divest their assets, writing, “We believe that ending institutional investment in companies that extract fossil fuels and contribute directly to climate change can help send a very powerful message that renewables and low-carbon options are the future.”