Submission + - Terrestrial carbon sinks reduced by a factor of four in 2023 (arxiv.org)
The chemically inert CO2 added to the atmosphere each year can only be removed by dissolving in the ocean or through photosynthesis. In 2023, global fossil CO2 emissions slightly increased compared to 2022, but atmospheric CO2 levels rose much faster, indicating weakened carbon sinks, particularly terrestrial ones. Heat stress, pest attacks, and fires have intensified, especially in the Amazon, Canada, and Russia, reducing photosynthesis and increasing tree mortality.
This deterioration was anticipated due to climate change but its timing was uncertain. Immediate emission reductions and replanting more resilient tree species are crucial to mitigate further damage, even if it reduces forestry productivity. Trees' economic insignificance compared to their ecological and geographical importance exacerbates the situation, suggesting a need for greater concern and action.