Gas leak at Nord Stream 2 as seen from the Danish F-16 interceptor on Bornholm, Denmark September 27, 2022.
But since both Nord Stream pipelines contained mostly methane, "the potential for a massive and highly damaging emission event is very worrisome", McCabe said.
Scientists say sharp cuts in methane emissions over the next few years will be a vital lever in curbing climate change.
Releasing that amount in entirety to the atmosphere would result in around 200,000 tonnes of methane emissions, said chemical engineer Paul Balcombe at London's Queen Mary University.
ENVIRONMENTAL RISKWhile oil spills can immediately affect and ultimately kill wildlife, authorities say the gas pipeline gas leaks pose a limited threat to the surrounding plant and animal life.