Dr. Wangari Maathai and Van Jones are both know for promoting what justice through environmental quality.

Dr. Wangari Maathai and Van Jones are both known for promoting environmental justice. This involves the fair treatment and meaningful involvement of all people regardless of race, color, national origin, or income with respect to the development, implementation, and enforcement of environmental laws, regulations, and policies.

Here are the steps to understand their work:

1. Dr. Wangari Maathai: She was a renowned Kenyan social, environmental and political activist. She was the founder of the Green Belt Movement, an environmental non-governmental organization focused on the planting of trees, environmental conservation, and women's rights. In 2004, she became the first African woman to receive the Nobel Peace Prize for "her contribution to sustainable development, democracy and peace."

2. Van Jones: He is an American news commentator, author, and non-practicing attorney. He is a co-founder of several nonprofit organizations, including the Dream Corps, a "social justice accelerator" which operates three advocacy initiatives: #cut50, #Yeswecode and Green for All. He is the author of The Green Collar Economy and Rebuild the Dream, both ranking as New York Times bestselling books. He served as President Barack Obama's Special Advisor for Green Jobs in 2009.

Both of them have dedicated their lives to promoting environmental justice, which is the fair treatment and meaningful involvement of all people in environmental matters. They believe that everyone has the right to live in a clean, healthy environment, regardless of their race, income, or nationality.