350 Brooklyn is a child organization of 350.org, a left-of-center environmentalist activist organization that advocates for policy to eliminate carbon emissions. It organizes protests, digital campaigns, and “town halls” with policymakers. 350 Brooklyn advocates for a complete transition to environmentalist-aligned energy, passing the Green New Deal, and reducing the use of plastics. 
350 Brooklyn is a sponsored project of the Social Good Fund.
350 Brooklyn organized numerous protests and mass mailings in opposition to the Trump administration’s appointments and environmental policies, describing his appointments as “Neo-Nazi, White Supremacist, and fascist.” 
350 Brooklyn has organized numerous protests of New York Governor Andrew Cuomo (D) in support of the Climate and Community Investment Act, which would institute a tax on greenhouse gas emissions and co-pollutants, with a total estimated annual state tax increase of $15 billion. It has also protested Cuomo for the state’s 529 investment funds for investing in fossil fuel companies. 
350 Brooklyn was founded by a group of protestors after participating in the 2014 People’s Climate March. It has a decentralized structure with leaders of different projects who have an equal vote in what the overall organization does. 
350 Brooklyn is a sponsored project of the Social Good Fund, a left-progressive fiscal pass-through organization that sponsors numerous left-wing advocacy projects. 350 Brooklyn does not classify as an independent 501(c)(3) and accepts donations through the Social Good Fund.