A University of Nottingham study published in Scientific Reports suggests peatlands may reach their physical carbon storage limit sooner than expected. Using computer simulations, engineers modelled a peatland over thousands of years and found that as peat thickens, its own weight can cause cracking, movement or sliding, especially on slopes. The results indicate peatlands may only expand to 1.48 times their current volume, not the 1.71 assumed in existing carbon projections. The findings have direct implications for restoration and carbon credit schemes like the IUCN UK Peatland Code. Many UK peatlands may already be at or beyond their modelled stability limits, so peat depth, slope and mechanical stability need to be considered when assessing whether carbon benefits will last. Rewetting remains essential for cutting emissions, but its effect on water movement could also affect stability in deep or sloping peat and should be assessed during restoration planning.
