About Us

Christiana Figueres

Christiana Figueres is a Costa Rican citizen and was the Executive Secretary of the United Nations Framework Convention on Climate Change from 2010-2016.

During her tenure at the UNFCCC Ms. Figueres brought together national and sub-national governments, corporations and activists, financial institutions and NGOs to jointly deliver the historic Paris Agreement on climate change, in which 195 sovereign nations agreed on a collaborative path forward to limit future global warming to well below 2C. For this achievement Ms. Figueres has been credited with forging a new brand of collaborative diplomacy.

Ms. Figueres is a founding partner of Global Optimism Ltd., a purpose driven enterprise focused on social and environmental change. She is currently the Convenor of Mission 2020, Vice-Chair of the Global Covenant of Mayors for Climate and EnergyWorld Bank Climate Leader, ACCIONA Board Member, WRI Board Member, Fellow of Conservation International, and Advisory Board member of Formula EUnilever and ENI.

Click here to download Christiana's speeches

Click here to watch Christiana's TED talk

Click here to download Christiana's Curriculum Vitae

Tom Rivett-Carnac

Tom is a Founding Partner of Global Optimism and works across the portfolio of engagements and initiatives. He has spent 20 years working at the intersections of international diplomacy, energy policy and climate change in business, non profit, financial services and international institutions.

Prior to co-founding Global Optimism, Tom was Senior Advisor to the Executive Secretary at the UN Climate Convention where he focussed on the political strategy towards achieving the landmark Paris Agreement in December 2015.  Before this he was President and CEO of CDP North America, an entity that utilizes the financial markets to drive greater disclosure of climate change related risks and opportunities in the operations of listed companies. Currently more than 7,000 companies report climate information to CDP, which is then reflected back to investors for use in valuation and asset allocation decisions. Tom also held other roles at CDP, including founding the Cities Program and serving as Director for the first global process to support disclosure by cities.

Earlier in his career Tom held roles at Dyson and also spent two years as a Buddhist monk. Tom has held or continues to hold Advisory positions at the Clinton Global Initiative, NY Stock Exchange, Leaders’ Quest and the Global Impact Investment Network.

Tom holds a BSc (Hons) in Environmental Economics from the University of Bath and an MSc in Systems Science from Plymouth University. He is married with two children and lives in London.

Marina Mansilla Hermann

Marina is Chief of Staff to Ms. Christiana Figueres, Former Executive Secretary of the UNFCCC and Convenor of Mission 2020. In this role, Marina supports Ms. Figueres across all her engagements and in the broader global effort to peak greenhouse emissions by 2020. She also leads Mission 2020’s Land Use and Nature Based solutions Milestone.

Previous to this role, Marina spent eleven years at Ashoka managing its strategy to transform education in Europe, bringing together social innovators, educators, thought leaders and influencers with the ultimate goal of reinventing learning as an experience that enables every child to become a changemaker. During her years at Ashoka Youth Venture, she mentored hundreds of young social innovators and supported the launch of dozens of environmental ventures globally.

Marina has been involved in the UN Climate Summits (COPs) since 2004, advocating for young people to be recognized as a key stakeholder in the negotiation process. She is also the founder of Fundación TierraVida, an Argentinean-based NGO working to unleash young people´s potential to drive environmental sustainability in Latin America.  Through her work with TierraVida, she has been named a British Council Climate Champion (2011), a Global Shaper with the World Economic Forum (2013) and a Global Good Fund Fellow (2014).

Earlier in her career, Marina worked for more than a decade with Peace Child International, as a consultant for a GEF/UNDP wetlands conservation project and served as a youth advisor to UNEP (2003-2007).


Marina has been trained by former vice-president and Nobel Peace Prize Al Gore as part of his Climate Reality Project. She currently serves as Faculty of Amani institute’s Social Innovation Management Programme. She holds a BSc. in Environmental Sciences, an MA. in Environment and Development from King's College London and is currently pursuing an Executive MBA at ESMT Berlin.