Keywords for this set:
air pollution, autumn, biology, branch, branches,
change, changes, climate, coal, conservation, cooling, cooling towers,
dirt,
earth, eco, ecology, ecosystem, electricity, emission, emissions, energy, environment, environmental, enviroment, enviromental, exhaust, field, fields, forest,
forestry, fossil fuel, fossil fuels, fuel, fuels,
garbage, garden, gardening, gas, gas pump, genetically modified,
global warming, gm, gm crops, gm food, grass, grasses, greengrass,
lawn, lawns, leaf, leafs, leaves, mud, natural, nature,
nuclear, oil, oils, park, parks, pesticides, petrol, petroleum, plant, plants, pollution, power lines,
power plant, power station, powerline, powerlines, pylon, pylons,
recycle, recycled, recycling,
smokestack, soil, sustainability,
tree, trees, turf
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