The idea was to create a statutory limit, or cap, on the overall amount of a certain type of pollution that could be emitted.
The researchers report in a paper in press in Geophysical Research Letters that pollution-control efforts reduced the overall amount of aerosols in the atmosphere by about 10%to15%5%.
These pollution-reducing fixtures also lower the overall amount of electricity needed to produce the same amount of well-lit, usable luminance over a particular area.
The overall amount of beef sold went up only 3percentt.
The overall amount of loans also falls far short of the $4 billion originally sought by Ukraine.
"The overall amount of spectrum has not changed".
Under a trading system, a government sets an overall cap on the amount of pollution companies can emit.
Research elsewhere has shown that these reduce the total amount of pollution created.
An uncertified wood stove emits 354 times the amount of pollution emitted by an oil furnace.
But running it creates a greater amount of pollution than a more efficient model.
