Global warming is well-known worldwide and its effects (floods, forest fires, heat waves, storms, etc.) are getting more intense and frequent. Global warming is largely due to the greenhouse effect, a phenomenon caused by the accumulation of gases in the atmosphere that form a barrier and trap solar radiation as well as heat. Greenhouse gases include CO2 and methane, to name just two. Each gas has its own impact on global warming (known as global warming potential or GWP), which is expressed in relation to the impact of CO2. Methane has a GWP of 25, which means that for the same quantity of gas, the impact on global warming of methane is 25 times as high as that of CO2. International climate conferences have initiated many discussions and negotiations between countries on targets and objectives for reducing greenhouse gases.