In the build-up to COP26 it's worth reflecting on progress made, and not made, since the Paris Agreement five years ago. Weeks after the Paris Agreement was signed, we passed the 'red line' threshold of concentration of CO2 in the Earth's atmosphere, and then kept going. Two years later we hit a monthly average of 411 ppin, with a peak of 414 ppm in May 2019. Even more worrying is a fact that David Wallace-Wells points out in his best-selling book, Uninhabitable Earth: more than half of the carbon emitted in the atmosphere today was emitted in the past 30 years.
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