Wooden construction elements often exhibit lower life cycle greenhouse gas (GHG) emissions than conventional counterparts (‘material substitution effect’). Moreover, the building stock represents a carbon (C) sink if timber inflows (construction) surpass outflows (demolition) (‘C-stock effect’).

A dynamic stock model incorporating these effects is applied to quantify potential climate benefits of wood construction in Austria's residential building sector. If present trends are maintained, culminating in a wood construction share (WCS) of 50% during 2050-2100, building shells could contain three times as much C in 2100 as today. Annual timber demand for residential construction could double, but would remain well below Austria's current net exports. Compared to a baseline scenario with constant WCS (22%), cumulated GHG savings from material substitution until 2050 are estimated 2 to 4.2 Tg CO₂-equivalent – clearly less than savings from C-stock expansion (9.2 Tg). Savings from both effects would double in a highly ambitious scenario (WCS=80% during 2050-2100).

The applied ’Stock Change Approach’ is consistent with IPCC Guidelines, but the above-mentioned savings from C-stock changes would not materialize under the current default GHG inventory accounting approach. Moreover, savings from C-stock effects must eventually be weighed against forest C-stock changes, as growing domestic demand might stimulate wood harvesting.

木制建筑元素通常表现出比传统建筑元素更低的生命周期温室气体（GHG）排放（“材料替代效应”）。此外，如果木材流入（建筑）超过流出（拆除）（“碳库效应”），则建筑存量表示碳汇。

结合了这些影响的动态存量模型用于量化奥地利住宅建筑部门木材建筑的潜在气候效益。如果保持目前的趋势，最终在2050-2100年间木材建筑份额（WCS）达到50％，那么到2100年，建筑外壳中的碳含量可能是今天的三倍。住宅建筑的年度木材需求可能翻倍，但仍将大大低于奥地利目前的净出口。与具有恒定WCS（22％）的基准情景相比，到2050年为止，材料替代所累计的温室气体节省量估计为2至4.2 Tg CO _2-当量-明显少于C-stock扩张所节省的温室气体（9.2 Tg）。在雄心勃勃的情况下（两种情况下，这两种方法都可以节省成本）（2050-2100年期间WCS = 80％）。

所采用的“库存变更方法”与IPCC指南一致，但是在当前默认的GHG库存核算方法下，上述从C股变更中节省的资金将无法实现。此外，由于国内需求的增长可能会刺激木材采伐，因此最终必须权衡来自碳库效应的节省与森林碳库变化之间的关系。