However , backyard barrel burning decreased only modestly from 0.6 kg to 0.5 kg , resulting in over one third of all dioxins in the year 2000 from backyard burning alone .
Total U.S. annual emissions decreased from 14 kg in 1987 to 1.4 kg in 2000 .
Backyard barrel burning decreased only modestly from 0.6 kg to 0.5 kg , resulting in over one third of all dioxins in the year 2000 from backyard burning alone .
Total U.S. annual emissions decreased from 14 kg in 1987 to 1.4 kg in 2000 .