They are pretty major producers of methane https://www.theguardian.com/sustainable-business/2016/nov/06/hydropower-hydroelectricity-methane-clean-climate-chang

They are pretty major producers of methane https://www.theguardian.com/sustainable-business/2016/nov/06/hydropower-hydroelectricity-methane-clean-climate-change-study https://www.theguardian.com/sustainable-business/2016/nov/06...