We investigate the causes of the renewed growth of atmospheric methane (CH₄) after 2007 using inverse modeling. We use the additional information provided by observations of CH₄ isotopic compositions to better differentiate between the emission categories. Accounting for the large uncertainties in source signatures, our results suggest that the post-2007 increase in atmospheric CH₄ was caused by similar increases in emissions from (1) fossil fuels and (2) agriculture and waste.