Eric Walker placed California v Exxon under California and the environment
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 California, and added California to US states and territories
Eric Walker added California Air Resources Board and New Rule in California Will Require Zero-Emissions Trucks - The New York Times and California to Ban the Sale of New Gasoline Cars - The New York Times to California and the environment, and added California and the environment to California and The environment, the Earth's ecosystem, ecology and environmentalism