The COP26 climate summit kicks off in Glasgow this weekend - one of the biggest ever world meetings on how to tackle global warming.
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But what's it all about? BBC News environment correspondent Matt McGrath answers some of your questions.
What is the impact of the quantity of methane on climate change? - Maya Yossifova, Vienna, Austria
Methane is a greenhouse gas, which is released from both natural sources, such as wetlands and termites, but also through human activities such as agriculture, fossil fuel exploitation and landfill sites.
It's a compound of carbon and hydrogen, and this makes it exceptionally good at trapping heat - and a major cause of climate change.
According to the World Meteorological Organisation, methane levels in the atmosphere reached 1,889 parts per billion in 2021.
Concentrations of CO2 are roughly 200 times higher, but methane is calculated to be more than 80 times more potent at warming over a 20-year period.
A United Nations report earlier this year said that efforts to reduce methane emissions should be focused on reducing emissions from landfill sites and gas wells, cutting down food waste and loss, improving livestock management, and encouraging consumers to adopt diets with a lower meat and dairy content.