Words to Know

Hazardous Air Pollutant (HAP)

Any air pollutant listed or pursuant to section 112(b) of the Clean Air Act. There are 189 regulated toxic chemicals on this list, including asbestos, beryllium, mercury, benzene, coke oven emissions, radionuclides, and vinyl chloride.

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Word of the day


A contraction of "permanent agriculture," coined in 1978 by Australian ecologists Bill Mollison and David Holmgren. Permaculture is an approach to developing ecological human habitats and food production systems that use land sustainable and build communities that harmonious integrate dwellings and agriculture in regard to climate, annual and perennial plants, animals, soils, and water use. Permaculture focuses not on the ...

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