Composting organics is a fine small-scale solution, but at large scale, composting produces CO2e emissions and methane, which has more than 80 times the warming power of CO2.
Source: https://www.gardenmyths.com/composting-climate-change/ + https://www.edf.org/climate/methane-crucial-opportunity-climate-fight
While composting is a better alternative for biowaste than landfills, Hydrothermal Carbonization (HTC) offers a better solutions for long-term sustainability and climate change reduction.