Eric Walker added a number of topics and a number of links to The environment, the Earth's ecosystem, ecology and environmentalism, and added The environment, the Earth's ecosystem, ecology and environmentalism to Nature, Science, engineering, mathematics and the humanities and "Earth" (deleted)
Eric Walker added a number of topics and a number of links to Environmental Protection Agency (EPA), and added Environmental Protection Agency (EPA) to Businesses and organizations involved with the environment and Branches and agencies of the United States government
Eric Walker added The Anti-Immigration Crusader - The New York Times to Sierra Club, and added Sierra Club to Businesses and organizations involved with the environment
Eric Walker added 2019-11 Sierra Club v Trump, Environmental Protection Agency (EPA) and Sierra Club to Businesses and organizations involved with the environment, and added Businesses and organizations involved with the environment to The environment, the Earth's ecosystem, ecology and environmentalism