Livestock - such as cows - produce methane when their stomachs are digesting hard fibres.
Billionaire Bill Gates has invested in an Australian climate technology start-up that plans to reduce the methane emissions of cow burps.Methane is the most common greenhouse gas after carbon dioxide .
University studies have shown that feeding cows seaweed could significantly cut their methane emissions. The investment firm is also backed by Amazon chief executive Jeff Bezos, and Chinese entrepreneur and Alibaba co-founder Jack Ma.
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