A new study published in Global Biogeochemical Cycles shows that the fastest-warming forests in Northern Eurasia are not absorbing more carbon despite rising temperatures. Researchers combined satellite data, atmospheric models, and vegetation simulations to find that forest health, measured by a metric called bonitet, matters more than warming rates for carbon uptake. The study estimates these forests absorb about 0.47 billion tons of carbon annually, roughly a third of the global land sink. But carbon absorption peaks in areas with moderate warming and drops off sharply in the coldest northeastern regions, where forests are less productive, burn more often, and lose carbon from thawing permafrost and increased soil respiration. The key takeaway is that forest quality, not just temperature, determines how well these ecosystems will continue to store carbon. This has direct implications for carbon offset projects and climate models that assume warming automatically boosts plant growth.
