Pre-Industrial concentration = 0.8 ppm (parts per million) or 800ppb or 0.00008%
2000 concentration = 1.866 ppm (parts per million ) or 1860 ppb = 0.000186%
Percent increase = 1060 ppb/800 ppb * 100 = 132%
Methane concentrations have more than doubled since the Industrial Revolution
