SanDiego350 is an inclusive volunteer organization building a movement to prevent the worst impacts of climate change and climate injustice. We strive to create a future that supports a livable planet and just society through education and outreach, public policy advocacy, and mobilizing people to take action.


Our vision is for an informed, mobilized and united community that is empowered to reduce our carbon footprint, and hold our elected officials accountable for creating a low-carbon, sustainable and just world. Our power comes from our alliance with social justice, environmental, labor, health, faith and other partners.

People and Teams

Meet our Board members and staff.  SanDiego350 has 14 volunteer teams, working on public policy, community education, youth engagement, organizing actions, coalition building, fundraising, and member engagement. Learn more about our teams.

Recent Accomplishments

Read more about our 2021 accomplishments in mobilizing support for climate action, policy advocacy, and youth empowerment.

Theory of Change

Governments and corporations will not take the necessary action to reduce the impact of climate change and climate injustice on their own due to the entrenched economic and political status quo of fossil fuel  dependence, corporate power, and economic, racial and other injustices.

An organized mass movement rooted in people power is needed to build up social and political pressure for change by galvanizing public support, countering the power of vested interests, and showing that alternative pathways to a thriving global community are possible, desirable and needed. Escalated pressure – coordinated across our networks – is required to achieve change in the rapidly shrinking window for effective action. 

Our efforts – education and outreach, public policy advocacy, coalition building, and mobilizing people to take action – strive not just to reduce GHG emissions, but to build political power with allies to create the better world we know is possible – together.

Why 350? What’s that?

350 is the number that leading scientists say is the safe upper limit for carbon dioxide (CO2) in our atmosphere. CO2 is measured in “parts per million” (ppm). For millions of years before the industrial revolution that number was roughly 270. We’re currently at about 417 ppm, and adding about 2 ppm per year. We must stop emitting greenhouse gases and bring that number back down to 350 as fast as possible. The current level of CO2 is in the side bar on the right.

350.org was founded in 2008 by a group of university friends along with author Bill McKibben, who wrote one of the first books on global warming for the general public, with the goal of building a global climate movement.

SanDiego350 is an affiliate of 350.org, but we’re a completely separate organization. We make our own decisions, set our own campaign priorities and do our own fundraising.


In September 2011 we brought together hundreds of San Diego County residents, and we collectively called on our elected representatives to take immediate, strong action on climate change as part of 350.org’s international day of action on climate change. After that event, we decided to form a group and started organizing San Diegans to take action on climate change. We’ve organized San Diego’s largest climate mobilizations, including the 5,500-person “People’s Climate March” in April 2017 and the climate walkouts in 2019. In 2014 we became a 501(c)(3) nonprofit organization and in 2016 we brought on our first staff person.


The organization’s policies are in the password-protected SanDiego350 internal web pages. Members may request access by emailing volunteer@sandiego350.org.


SanDiego350 Team Building Meeting January 2017 at Palomar Unitarian Universalist Fellowship in Palomar