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 Deepwater Horizon oil spill to Environmental disasters, and added Environmental disasters to The environment, the Earth's ecosystem, ecology and environmentalism

Eric Walker added In Deep Water (Gulf Oil Disaster) - YouTube to Deepwater Horizon oil spill, and added Deepwater Horizon oil spill to Environmental disasters