Eric Walker added Inside the Koch Brothers’ Toxic Empire – Rolling Stone to a number of topics

Eric Walker added Koch Brothers' Activism Protects Their 50 Years in Canadian Heavy Oils - Reuters to a number of topics

Eric Walker added a number of topics and a number of links to Fossil fuels, and added Fossil fuels to Energy and energy policy

Eric Walker added Bitumen as an energy source to Bitumen, and added Bitumen to Atoms, molecules, chemicals, minerals, materials and compounds

Eric Walker added Inside the Koch Brothers’ Toxic Empire – Rolling Stone and Koch Brothers' Activism Protects Their 50 Years in Canadian Heavy Oils - Reuters to Bitumen as a source of oil and fuel, and added Bitumen as a source of oil and fuel to Bitumen and Fossil fuels