On top on releasing greenhouse gases after organic waste is deposited, throwing food away can’t undo all the emissions and atmospheric pollution which production, transportation and storage of these products caused. Therefore, these emissions, being already in the atmosphere, are a double waste since they do not benefit anyone when food is thrown.
Organic waste is called biodegradable because it can get decomposed naturally into carbon, water, and biomass. Around 60-70% of all the waste that we currently produce is biodegradable.
Non-biodegradable waste (e.g., most of the plastic) takes much longer to decompose, increasing trash that cant’s be re-used (unless recycled). Just imagine what happens when there’s no more space to store plastic!