Environment Bill

Debate between Baroness Boycott and Duke of Wellington

Committee stage
Monday 12th July 2021 Lords Chamber

[The Duke of Wellington (CB) [V]]

My Lords, I support Amendment 259, tabled by the noble Baroness, Lady Young of Old Scone. It is tragic how many of our native trees have died and are dying from imported diseases. I hope that the noble Viscount, Lord Trenchard, will not mind me gently correcting him on one point. The giant sequoia tree—known in this country as the Wellingtonia—was imported from California many years after Capability Brown and Humphry Repton. I also support Amendment 260A, tabled by the noble Earl, Lord Kinnoull, and particularly the need, as has been mentioned by a number of noble Lords, to try to find a way to control grey squirrels, who are certainly destructive of so many tree species in this country.

I now turn to Amendment 283 and wish to pose some questions. The amendment has been tabled by the much-respected noble Baronesses, Lady Jones of Whitchurch, Lady Jones of Moulsecoomb and Lady Bennett, and the noble Lord, Lord Teverson. I often agree with them on their amendments, but on this one I fear it is far too complex a matter to be solved simply by a ban on burning heather, bracken and other vegetation. I must make it clear that I have no interest to declare, other than that one of my children is trying in Scotland—which I think is outside the scope of this Bill—to regenerate heather in an area where there are no grouse and have not been for many decades. So far there, they have not burnt heather but are experimenting with cutting. Heather burning has become controversial, but it has been used for generations for moorland management and often in areas where there are no grouse.

I commend to noble Lords two papers that I have read recently. One is entitled “Experimental evidence for sustained carbon sequestration in fire-managed, peat moorlands”, published in Nature Geoscience in December 2018, and I quote from it:

“we quantify the effects of prescribed burning … and show that the impacts … are not as bad as is widely thought.”

The second paper I commend is the report of the Molland Moor project on Exmoor, where also there is no grouse interest. This study was co-ordinated by the Exmoor National Park Authority and brought together landowners, conservationists, farmers, ecologists and academics. The lessons learned from the project include:

“We can regenerate heather by burning on as large a scale as possible … We can control the Molinia and reduce the stands of bracken”.


The report comments that it is necessary to micromanage each small area, as there are so many variables. It continues:

“National policy makers must understand this. Molland Moor is hugely different”


from the moor next door.

In March, we debated the Heather and Grass etc. Burning (England) Regulations 2021, which ban the burning without licence of heather on peat over 40 centimetres in depth, on sites of special scientific interest, in special areas of conservation and in special protection areas. In that debate, the noble Baroness, Lady Bakewell of Hardington Mandeville, talked with local knowledge about terrible wildfires on Dartmoor and Bodmin Moor. The noble Earl, Lord Caithness, described a horrendous fire in Caithness and Sutherland in 2019. It burned for six days and emitted 700,000 tonnes of CO₂ equivalent. I mention these fires as there is plenty of evidence that controlled burning in relatively small strips at the right time of year and in the right place creates, among other outcomes, firebreaks against wildfires. The risk of wildfires is greater on unmanaged moorland, as old heather becomes woody and tinder-dry. Wildfires do much more damage to peat and to the environment generally than controlled, limited burns, sometimes described as “cool burns”.

All I am saying, and I repeat that I have no direct interest, is that this is a complicated matter on which the science is still evolving. Therefore, to include a ban in the Bill would be inappropriate. I suggest to Ministers that they consider and gather more evidence. Clearly, there should be rules, and perhaps they should be in a future regulation, but such rules must recognise that no two areas of land are ever exactly the same. Of course, this general point may be one of the difficulties of the new environmental land management schemes.

In conclusion, I could not support Amendment 283, but I look forward to hearing the Minister’s view.

[Baroness Boycott (CB)]

My Lords, it is a great pleasure to follow the noble Duke, the Duke of Wellington. I absolutely agree with him that no two pieces of land are exactly the same.

I support Amendment 260 in the names of the noble Baronesses, Lady Young and Lady Jones, the noble Earl, Lord Caithness, and the noble Lord, Lord Teverson, in particular proposed subsection (3) about the percentage of native woodland and the new native woodland that is achieved by natural regeneration.

I draw the Committee’s attention to the work of Professor Simard at the University of British Columbia. When she was 20, she was put to work on commercial forestry—the process of clear-cutting large areas of old-growth forest and planting individual seedlings, pine or birch, in neat and regimented rows. The thinking was that, without any competitors, trees would grow faster, taller and stronger. Instead, they were more frequently found to be vulnerable to disease and climatic stress than the older trees, which shared their patch of soil with other plants, mosses, firs and associated lifeforms. In particular, she studied the newly planted Douglas firs—great giants which provided valuable wood to the logging companies. Ten per cent of those plants invariably got sick and died whenever nearby aspen, paper birch and cottonwood were removed. Initially, when she was 20—she is now 60—she did not know why, because the trees had plenty of light and water, more than the old trees in the crowded forest. She worked through her life and in the end revealed and became the inventor of what is known as the “wood wide web”. The forest, she wrote, is like the internet, but instead of computers linked by radio waves, the trees are connected by fungi. There are centres and satellites, with the oldest trees as the biggest communication hubs. When the piece with her theory was published in Nature in 1997, it had that title of “Wood Wide Web”, and the name has stuck.

Once the underground pattern is understood, it is easy to see how seedlings can emerge in clear ground, because they have been nurtured underground by other trees, waiting for their moment to start growing. They are being fed by the mother trees—the central hub that the saplings and seedlings spring from—with threads of different fungal species, of different colours and weights, linking them layer upon layer in the strong and complex web. When the forest is cleared and the mother trees are cut down, the forests lose their way.

Professor Simard’s discoveries have kept coming, and she now finds that trees support each other in times of stress, drought or disease, and they can communicate needs and send supplies. Since Darwin, biologists have always maintained that survival is all about the selfish gene, doing anything to get ahead in the evolutionary race. But her work tosses that on its head.

We now understand that monocultures, whether of crops, trees or any plant species, are not healthy. My plea would be that in the tree strategy we understand that all new planted forests and woods must be of multiple trees. I absolutely agree with the noble Earl, Lord Devon, when he says we should start experimenting with trees, especially in the south of England, that will thrive in our newly warmed environment. But please do not let us spend all our tree-planting money on monocultures which end up leaving dead soil beneath that is not home to myriad mosses and animals and, in fact, ends up sequestering much less carbon than a mixed forest growth.