GGRA03H3 Lecture : You're welcome

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material that has no apparent, obvious or significant economic or beneficial value to humans that is intentionally thrown away for disposal. composition of dumps and amount of garbage changed radically after wwii, a whole range of material were developed, such as plastic. before wwii, not a lot of waste were toxic. Increase in wealth in the past 50 years, packaging material become such a small amount of the whole cost. From 1960 to 1990 us garbage production per capita almost doubled from 2. 7 lbs/per capita to 4. 5 lbs/per capita. major change in composition of waste, grow of plastic products and packaging, household chemical, disposable products. First half of 20th century, most dumps were pits in valleys or off cliffs. Increase concern about rats, disease, led to development of sanitary landfill" technology. water draining from dumps was highly toxic, liners are now used.

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