Natural gas wells may not be leaking as much methane into the air as originally thought, according to a new University of Texas study on the issue.

The results published Monday show that only 0.42 percent of all produced natural gas at the study sites was leaking during the fracking and drilling process.

Those numbers are far lower than a widely criticized study produced in 2011 by researchers at Cornell University that suggested that as much as 7.9 percent of natural gas developed from shale was leaking into the atmosphere.

Scientists visited and monitored 489 natural gas wells in the United States for the University of Texas study which was partially financed by nine energy companies that drill for natural gas as well as the Environmental Defense Fund.