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From the linked article:
"The disposal of organic waste poses an environmental challenge as it emits large amounts of greenhouse gases including methane and carbon dioxide, which contribute to climate change," explained RMIT University engineer Rajeev Roychand.
That is ridiculous. Organic waste releases whatever was used to grow it in the first place. It's inherently renewable. A really bad argument for this guy's coffee-flavoured concrete idea.
@jasonetheridge not quite. If the "original carbon" ends up being CO2 then it's got a particular warming potential. If it rots and becomes CH4 then the potential is 80x in the 1st 20 years. That's why burning landfill gas is a net positive for warming.