Falling at the first fence - Luke Hughes gives the facts behind public vs private management of forests
So the Government has shied away from the proposed sale of ‘ancient woodlands’, sheepishly mumbling into interviewers’ microphones that they ‘might have got this one wrong’. Michael Heseltine, normally impervious to political correctness, said on Question Time that he was unaware of any reasons that suggested private or public ownership of forests was necessarily better. He clearly had not read my blog of 8 February. Doubtless it was the prospect of a nationwide tree-hugging session, led by ‘celebs’, that made the politicians wobble.
I am visiting Bangalore, as part of a lecture tour for architects and designers about designing with hardwoods. Banglaore’s extremely smart new airport boasts equally smart advertising hoardings extolling a local project to plant 1.5 lac (=1,500,000) plantation saplings in the local area - highly commendable in a country that was largely de-forested before the Buddha began his teachings in the 6th century BCE. Sadly, much of it will be plantation-grown (rather than natural forest-grown) eucalypts and teak. These tend to be faster-growing, broader-grained and are generally less dependable, a consequence of relying on a regional or federal state to promote mono-cultures, rather than empowering owners who have a more genuine interest in the long-term future of the woodlands to allow afforestation (i.e. letting the trees sow themselves) to take its natural course.
The politically unwelcome fact is that forestry fares much better in private hands (at least in countries where there is a reasonably high standard of living). In the USA, 81% of hardwood forestry is privately owned, mostly in small plots (less than 10 hectares), in Europe, the figure is above 63%, with an average plot size of 13 hectares. In a recent US survey, the reasons given for private ownership are varied and include, in descending order of priority: the beauty of the scenery, the pleasure derived from passing it on to heirs, privacy, hunting and fishing, maintaining the integrity of a farm or ranch… only 30% said it was for the economic return from timber production. This is not so surprising - if you have to wait 60 years for a return you may as well savour other values less obviously measured in terms of cash.
The net result is that hardwood forest cover has, in private hands, tripled in the USA since 1880 and doubled since 1953. In Europe, forests are expanding at an annual net rate of 645 million cubic metres. In practice just 64% of that increment is harvested, with growth exceeding harvest by such a large margin that, unless timber removals are increased, the region’s forests may suffer reduced vigour and greater susceptibility to insect, disease, storm and fire damage. The eco-lobby correctly argues that wood helps the environment in all kinds of ways, including the fact that it helps to lock up carbon and increases the ‘carbon sink’. However, mature trees are less efficient at absorbing CO2 and all trees eventually die and rot - so the best way to use forests as carbon sinks is to harvest the timber when it is mature and convert it into products, whilst replanting more trees than before (or letting woodlands afforest on their own, which is largely what happens in the USA).
Cutting down trees? Private ownership of forestry? Increasing forest cover? Not what the tree-huggers want to hear.
Just to round off with some statistics:
- European and North American forestry accounts for 41% of the world’s forest cover
- The forest cover in the EU25 is on average 35%. Some countries, such as Finland and Sweden, have well over 65%; Austria has 47%; France, Germany and Poland have around 30%. The UK has 12%.
- Shipping timber across the Atlantic (more than 6000km) requires little more energy than an overland journey of 500km.
- Converting wood into usable building products requires far less energy than other materials; in fact, 75% of the energy required to manufacture kiln-dried timber is derived from biomass (tree-bark, saw dust and off-cuts).
- The embodied energy of common building materials (in Mj/kg) are:
Dried sawn hardwood 2
Mild steel 34
Aluminium 170