As microbes decompose dead plant in the melting soil, they release carbon dioxide that then adds to global warming.
(microbes; decompose; dead plant in the melting soil) (they; release; carbon dioxide that then adds to global warming) (carbon dioxide; adds; to global warming; T:then)
microbes they carbon dioxide
decompose release adds
dead plant in the melting soil
carbon dioxide that then adds to global warming
to global warming T:then