One of the few benefits of Covid-19 was the massive decline in the number of aircraft spewing filth into our upper atmosphere and thereby hastening global warming in a uniquely direct and effective way. And one of the depressing consequences of the semi-triumph over Covid has been holidaymakers and others flocking back to air travel. The evidence for the latter was on display one morning recently when I gazed up at the aerial graffiti on display in the blue sky above me. Each vapour trail (contrail) is evidence of water condensing to form ice crystals around small particles of soot from the aircraft engines. These trails have been described as "one of the few manifestations of man-made climate change agents that you can actually observe".
photo © T. Boughen Camera: Sony DSC-RX100
