Angela Francis finds ways to work on changing our human systems -- energy, production, consumption, transport and planning -- to bring them in line with our environment.

The author of "Investing in Kids," Timothy Bartik studies state and local economies -- and analyzes the benefits of preschool as an economic development program.

Tim Jackson is a British ecological economist and professor for sustainable development at the University of Surrey. He is the author of "Prosperity without Growth" and director of the Centre for the Understanding of Sustainable Prosperity.

Paul Dickinson works to create a global economic system that operates within sustainable environmental boundaries and prevents dangerous climate change.

Nic Marks gathers evidence about what makes us happy, and uses it to promote policy that puts the well-being of people and the planet first. He's the founder of the Centre for Well-Being at the UK think tank New Economics Foundation (NEF).

With passion, drive and a team of sustainability professionals, Pia Heidenmark Cook leads the sustainability agenda for the Ingka Group.

Kristalina Georgieva has helped shape the agenda of the European Union.

Lisa Jackson is an environmental and social impact leader who has dedicated her career to building a greener and more just economy.

David Keith studies our climate, and the many ideas we've come up with to fix it. A wildly original thinker, he challenges us to look at climate solutions that may seem daring, sometimes even shocking.

Cooperative enthusiast Anu Puusa wants to spread the word about co-ops -- and their potential as a sustainable business model that achieves long-term social, economic and environmental goals.

Michael Pollan is the author of "The Omnivore’s Dilemma", in which he explains how our food not only affects our health but has far-reaching political, economic and environmental implications.

Sandrine Dixson-Declѐve is the co-president of the Club of Rome, which published the foundational "Limits to Growth" report 50 years ago, and a co-architect of the Earth4All initiative.

Joe Lassiter focuses on one of the world’s most pressing problems: developing clean, secure and carbon-neutral supplies of reliable, low-cost energy all around the world.

Tasso Azevedo has helped reduce the rate of deforestation in Brazil’s Amazon rainforest by 75 percent — and inspired similar efforts around the world.

Hongqiao Liu is an independent journalist and policy advisor who has been covering China’s environmental crisis and decarbonization since 2010. She writes Shuang Tan, a newsletter in which she decodes China’s climate and energy policies for the world.

A powerful thinker and globe-trotting advisor on sustainability, Louise Fresco says it's time to think of food as a topic of social and economic importance on par with oil -- that responsible agriculture and food consumption are crucial to world stability.

Architect William McDonough believes green design can prevent environmental disaster and drive economic growth. He champions “cradle to cradle” design, which considers a product's full life cycle -- from creation with sustainable materials to a recycled afterlife.

Enric Sala is a former university professor who saw himself writing the obituary of ocean life and quit academia to become a full-time conservationist as a National Geographic Explorer-in-Residence.

Britain's former prime minister Gordon Brown played a key role in shaping the G20 nations' response to the world's financial crisis, and was a powerful advocate for a coordinated global response to problems such as climate change, poverty and social justice.

Gavin McCormick is a cofounder of the Climate TRACE coalition, which combines satellites and artificial intelligence to detect human-caused greenhouse gases from all major sources.

Jamila Raqib works on pragmatic approaches to nonviolent action for activists, human rights organizations, academics and governments globally.

Rebeca Hwang is co-founder and managing director of Rivet Ventures, investing in solutions for women and empowering their choices.

Asali DeVan Ecclesiastes imagines equitable solutions to community and societal problems and works with her community to implement those solutions.

At Purpose, Jeremy Heimans strategizes how to harness new social, economic and technological models to build movements with impact.

Stephen DeBerry uses the economy and culture to build a more just and joyful society.

Aziza Chaouni focuses on projects that integrate architecture and landscape, and that ultimately give back to their communities. For years, she has worked to revive the Fez River, which runs through her hometown of Fez, Morocco.

Severn Cullis-Suzuki is a lifelong environmental activist seeking justice for future generations.

Sevidzem Ernestine Leikeki has a drive to care for nature, foster women's empowerment and build future nature-lovers.

Marah J. Hardt keeps one foot wet in the field while the other wanders the crossroads of science, storytelling and strategy.

As chief investment officer of Japan's Government Pension Investment Fund, Hiro Mizuno led substantial transitions in the portfolio's asset allocation, marked by a strong environmental, social, and governance mentality.