How are they worse than any alternative? If I dump my food waste in the garden, is that emitting less GHG than letting it decompose in a landfill? Is it that i

How are they worse than any alternative? If I dump my food waste in the garden, is that emitting less GHG than letting it decompose in a landfill? Is it that it comes out as methane from landfills but less harmful CO2 from a little pile? That should be solved by flaring the methane.