It often happens, when dealing with natural systems, that we find them to be far more complex and clever than we had expected. The natural world is indeed a wonderful system. Consequently when we humans interfere, and attempt to 'improve' matters, our actions prove to be less efficient than expected. We seem simply to shift problems to another area, rather than solve them. For example in the fossil fuel debate, there has been much lobbying for 'cleaner' power generation and much promotion has been made of the 'clean' power of hydroelectricity.
Livestock are another source of methane.
Every time cattle, sheep, and goats burp, methane is released. Bacteria in these animals' intestines break down the food they eat, converting some of it to methane gas. This is also true of cud-chewing animals such as camels, buffalo, and deer. A cow, for instance, can belch or otherwise release methane from its stomach or bowels amounting to one tenth of a kilogram each day, and that represents a lot of gas. Consider now the population growth which has occurred since the mid-eighteen hundreds.