Emissions from lakes are increasingly being recognized as an important global source of atmospheric methane, contributing upwards of 10% of emissions. 
Polar Lake Ecology: Methane Dynamics in Icelandic Lakes
Dickinson College
Polar Lake Ecology: Methane Dynamics in Icelandic Lakes
Dickinson College
Emissions from lakes are increasingly being recognized as an important global source of atmospheric methane, contributing upwards of 10% of emissions.