From Bruce Denness, Niton, Isle of Wight, UK
What can explain atmospheric carbon dioxide at the Mauna Loa Observatory in Hawaii increasing by a record-breaking 3.58 parts per million in 2024? As well as forest fires and our failure to stop burning fossil fuels, I suggest the oceans, hitherto a big sink for taking up CO2 from the atmosphere, have become saturated (25 January, p 13).
