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Journal Article
The carbon costs of global wood harvests
2023
Overview
After agriculture, wood harvest is the human activity that has most reduced the storage of carbon in vegetation and soils
1
,
2
. Although felled wood releases carbon to the atmosphere in various steps, the fact that growing trees absorb carbon has led to different carbon-accounting approaches for wood use, producing widely varying estimates of carbon costs. Many approaches give the impression of low, zero or even negative greenhouse gas emissions from wood harvests because, in different ways, they offset carbon losses from new harvests with carbon sequestration from growth of broad forest areas
3
,
4
. Attributing this sequestration to new harvests is inappropriate because this other forest growth would occur regardless of new harvests and typically results from agricultural abandonment, recovery from previous harvests and climate change itself. Nevertheless some papers count gross emissions annually, which assigns no value to the capacity of newly harvested forests to regrow and approach the carbon stocks of unharvested forests. Here we present results of a new model that uses time discounting to estimate the present and future carbon costs of global wood harvests under different scenarios. We find that forest harvests between 2010 and 2050 will probably have annualized carbon costs of 3.5–4.2 Gt CO
2
e yr
−1
, which approach common estimates of annual emissions from land-use change due to agricultural expansion. Our study suggests an underappreciated option to address climate change by reducing these costs.
A new model uses time discounting to estimate the present and future carbon costs of global wood harvests under different scenarios, suggesting an underappreciated option to address climate change.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 704/172
/ Biofuels
/ Carbon
/ Conservation of Natural Resources - economics
/ Conservation of Natural Resources - methods
/ Conservation of Natural Resources - trends
/ Costs
/ Forests
/ Harvest
/ Humanities and Social Sciences
/ Land use
/ Science
/ Sustainable Development - trends
/ Trees - growth & development
/ Wood
