I will investigate how bacteria that grow on methane (a potent greenhouse gas) are able to do so in the absence of oxygen. Traditionally, methanotrophic bacteria (bacteria that oxidize and grow on methane) are known to depend on oxygen; but recently, scientists have encountered evidence of methane consumption by bacteria in methane-rich but anoxic deep waters of lakes (i.e. in the absence of oxygen). Current predictions indicate that lakes will get warmer and less oxygenated, leading to the question of how methane consumption and thus methane emissions will be affected in these ecosystems. Therefore, the findings from my work could help understand how methane emissions to the atmosphere will be affected in future ecosystems.