How is this “FACT”, rather than pseudoscience BS?
The American Buffalo is a prolific farter; those herds were HUGE until the last half of the 1800’s.
How many “Methane Monitoring Stations” existed back then? Where were they? How good are those records, Yah can't use a thermometer, or any other simple tool, to measure your city's Methane Level.
Quote from Wikipedia:
“Methane in the Earth’s atmosphere is an important greenhouse gas with a global warming potential of 25 over a 100-year period. This means that a methane emission will have 25 times the impact on temperature of a carbon dioxide emission of the same mass over the following 100 years. Methane has a large effect for a brief period (a net lifetime of 8.4 years in the atmosphere), whereas carbon dioxide has a small effect for a long period (over 100 years). Because of this difference in effect and time period, the global warming potential of methane over a 20 year time period is 72. The Earth’s methane concentration has increased by about 150% since 1750, and it accounts for 20% of the total radiative forcing from all of the long-lived and globally mixed greenhouse gases.[13] Usally, excess methane from landfills and other natural producers of methane are burned so CO2 is released into the atmosphere instead of methane because methane is such a more effective greenhouse gas.”
Link: http://en.wikipedia.org/wiki/Methane
http://www.grida.no/publications/other/ipcc_tar/?src=/climate/ipcc_tar/wg1/017.htm