Авторитетнейший Nature пишет об обратном:
The effect of carbon fertilization on naturally regenerated and planted US forests...
In the United States, over the last two decades, a large forest C-sink has sequestered 700-800 million tons of CO2 per year, which is roughly 10-11% of US gross CO2 emissions. In addition, the per-hectare volume of trees has increased over the last 50 years. Among the ten forest groups in this study, all except Aspen-Birch have increased their per-hectare wood volume from 1997 to 2017 (Fig. 1).