GCHQ personnel are flying up to 60 million kilometres per year, equivalent to 1,500 trips around the world despite having no official overseas operations GCHQ’s greenhouse gas emissions from staff travel were 30% higher than Home Office last year despite having five times fewer staff GCHQ blocks release of data on nearly all its carbon emissions, but internal reports show its efforts to reduce greenhouse gas emissions have failed In 2013 accident, GCHQ leaked biocide into local watercourse around one of its sites, sparking investigation by Environment Agency Britain’s largest intelligence agency, GCHQ, has emitted a “surprisingly high” average of 11,116 tonnes of greenhouse gas (GHG) emissions on staff travel over the past eight years, it can be revealed.