Texas, the United States’ leading emitter of greenhouse gases, has approved 43 petrochemical projects along the Gulf Coast since 2012 that will add millions of tons of greenhouse gas pollution to the atmosphere, according to an environmental study released this week.

Released by the Environmental Integrity Project, a Washington, D.C.-based, nonpartisan environmental watchdog group, the report examined state records that detailed which plants in Texas and Louisiana applied for permits allowing an increase in greenhouse gas emissions from 2012 through 2018.

Overall, 74 permits have been issued since 2012 in the two states to add 134 million tons of pollution to the atmosphere. That amount of pollution over a six-year span is equivalent to 29 new coal-fired power plants running around the clock, the report said.