In the 1990's, the US addressed the issue of acid rain by placing a limit on the amount of sulfur dioxide (SO2) emissions. Companies were issued permits that allowed them to emit a specified amount of sulfur dioxide but if they did not emit their allowed amount, they could sell their excess permit to another company who needed to emit more. This market based strategy for lowering emissions is also called: Group of answer choices command and control cap and trade greenwashing subsidies green taxes