It's the most powerful greenhouse gas known to humanity, and emissions have risen rapidly in recent years, the BBC has learned.
Sulphur hexafluoride, or SF6, is widely used in the electrical industry to prevent short circuits and accidents.
But leaks of the little-known gas in the UK and the rest of the EU in 2017 were the equivalent of putting an extra 1.3 million cars on the road.
SEAS attended the Cabinet meeting at Suffolk County Council on January 14th where Councillor Richard Rout, Cabinet Member for Environment and Public Protection, presented their response to SPR's DCO proposals for offshore windfarms East Anglia One North (EA1N) and East Anglia Two (EA2). Find out exactly what your local Suffolk County Councillors have said to add weight to your Representations.
Plans for offshore windfarms off the Suffolk coast have not been thought through adequately, says Suffolk County Council. Among the issues raised were the visual impact on the Area of Outstanding Natural Beauty, impact on tourism, the severe effects on the village of Friston, doubts about the planting mitigation, noise and disturbance on communities and road networks.