Since 2011, California has used a greenhouse gas cap-and-trade market as one of its programs aimed at reducing carbon emissions over time.
Since 2011, California has used a greenhouse gas cap-and-trade market as one of its programs aimed at reducing carbon emissions over time. David McNew Getty Images file
Since 2011, California has used a greenhouse gas cap-and-trade market as one of its programs aimed at reducing carbon emissions over time. David McNew Getty Images file

Environment

July 12, 2016 6:00 AM

Why are the world’s cap-and-trade markets struggling to keep prices up?

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