Peat is effectively non-renewable on a human timescale, because a bog builds up only about 0.5-1 mm a year, so cutting one is spending a store that took millennia to form, not harvesting a crop. Use peat as a transitional fuel, cut only the edges, replace the turf, never drain a bog entirely, and move to a renewable fuel such as coppice wood.
Part of Peat Harvesting
What cutting peat costs a bog and the climate, and the rules that limit the damage.
A Bog Is Not A Field
A field regrows each year. A bog regrows a millimetre or so a year. The parent article is explicit: at the ideal rate of 0.5-1 mm a year, a 2 m deep bog took 2,000-4,000 years to form, so peat is effectively a non-renewable resource on human timescales. Taking a metre off the top spends 1,000-2,000 years of growth (1,000 mm ÷ 1 mm a year to 1,000 mm ÷ 0.5 mm a year). The honest framing for a rebuilding community is that peat buys time while coppice woodland grows (Coppicing & Fuel Management).
What Cutting Costs
- Habitat. The bog’s moss, plants and wildlife are lost where it is cut.
- Water. A bog holds water like a sponge. Cutting and draining it changes how water leaves the surrounding land.
- Carbon. A bog holds a large carbon store, and drying it lets that carbon escape; see Carbon Implications.
- Time. The loss is slow to reverse: see Regrowth Rate.
Rules That Reduce The Damage
The parent article’s rules: never drain a bog entirely, because draining destroys the ecosystem permanently; harvest from the edges, leaving the centre intact; replace turf caps after cutting; rotate cutting areas with 20-30 year rest cycles; and use peat as a transitional fuel. A rest cycle gives the surface vegetation time to recover; it does not rebuild the peat you took (Sustainable Harvesting Limits).
Common Mistakes
- Treating peat like a renewable woodlot. The rate of use exceeds the rate of growth by orders of magnitude.
- Cutting a deep drain across the bog. It dries everything uphill of it.
- Cutting the whole bog from the centre. The edges hold the water in.
Safety
A drained bog burns
Dried peat can ignite from a spark, a camp fire or hot ash, and the fire spreads through the ground itself, burning below the surface for months and re-igniting what is above. Keep hot ash off peaty ground, keep fires off dry bog, and stay off ground that smokes. A drained and cut-over bog can also be soft and hide deep water.
What’s Next
- Learn next: Regrowth Rate — the arithmetic of renewal
- Combine with: Coppicing & Fuel Management — the renewable alternative