No Action Without Science – 2022 Is Crucial
It is bloody late for deep emissions reductions to stay on a 1.5°C trajectory. Nevertheless, this is still needed and the IPCC had made an effort this summer to quantify how to do so. In its first report of the 6th assessment cycle, focusing on the physical facts of where we stand today, the results are really sobering.
Atmospheric CO2 concentrations and the rate of ocean surface water acidification, resulting mainly from burning fossil fuels over the past two hundred years, are the highest they have been in at least two million years. Indeed, some indicate the highest in the last 10 million years. The last time CO2 concentrations were this high, global temperatures were at least 2.5°C warmer and sea levels several meters higher. Such data clearly indicates the dangerous carbon legacy humankind is injecting into the atmosphere day by day. But the full impacts of this legacy will only be revealed in the future, because of the delayed response of the global climate and earth systems.
The world must immediately start to phase out fossil fuels; and protect and restore carbon in natural ecosystems in this decade to limit the increase of atmospheric CO2, the key driver for global warming.
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