Classificação da Biblioteca do Congresso dos E.U.A. (LCC)TD302.9

activism(16) agriculture(30) American West(13) animals(31) archaeology(19) architecture(31) California(38) chemistry(26) children(55) children's(62) cities(14) civil(8) climate(13) climate change(67) conservation(140) construction(23) corporations(10) current events(16) development(17) disasters(16) diy(16) earth(48) eco(6) ecology(156) economics(29) ecosystems(8) educational(19) energy(21) engineering(69) environment(519) environmental(39) Environmental aspects(7) environmental issues(16) environmental policy(6) environmental studies(11) environmentalism(45) experiments(8) gardening(40) general science(10) geography(37) geology(39) global(8) green(20) health(25) history(174) homesteading(19) India(16) industry(8) informational(72) international(9) juvenile(20) juvenile non-fiction(9) maps(16) multicultural(27) natural disasters(8) natural resources(43) nature(117) nyc(14) ocean(41) oceans(20) oil(34) photographs(11) photography(26) picture book(178) pink(14) planning(11) policy(18) political science(14) politics(59) pollution(139) ponds(8) public health(6) rain(29) reference(48) resources(19) rivers(32) sanitation(21) school(35) science(819) science and technology(8) science nonfiction(13) self-sufficiency(15) sustainability(72) sustainable development(5) sustainable living(8) treatment(11) urban planning(7) urban studies(9) usa(19) usda(5) waste(5) water shortage(5) watershed(12) weather(60) wildlife(9) world(10)