u.s. sen. ron johnson voted to let oil and gas companies emit "unlimited carbon pollution into our air"
u.s. sen. ron johnson voted to let oil and gas companies emit "unlimited carbon pollution into our air"
emissions trading:31
according to the environmental defense fund, cap-and-trade is the most environmentally and economically sensible approach to controlling greenhouse gas emissions, the primary cause of global warming, because it sets a limit on emissions, and the trading encourages companies to innovate in order to emit less.