International Scientists to UK: Spending Billions to Burn Trees Won’t Help the Climate

The following letter has been sent to Ministers of the UK government.  Download a copy of the letter here.
(photocredit: Dogwood Alliance)

March 15, 2017

Re: Concerns about UK Bioenergy Policy

Dear Secretary of State, Mr. Hurd and Mr. Norman,

We, the undersigned scientists, write to express our concern that UK policies subsidizing biomass energy are accelerating forest harvesting internationally and hindering efforts to combat climate change. We understand you are currently formulating the UK’s Energy Policies and Industrial Strategy, and we accordingly urge you to reduce threats to forests and the climate by ending subsidies for large-scale biomass electricity.

To prevent dangerous global temperature rise, climate modeling indicates the need for negative emissions.[1] Staying below a 2 C temperature rise will likely require expanding forests, not cutting and burning wood for energy.  Yet bioenergy incentives in the UK are now driving forest harvesting internationally as the UK imports millions of tonnes of woody biomass from the USA, Canada, Estonia, Germany, Latvia, Poland, Portugal, and South Africa.[2] Wood pellet manufacturing has increased steeply.  In the Southern USA, existing and under-construction pellet manufacturing facilities are on track to consume 20.3 million tonnes of wood per year, with proposed facilities accounting for another 18.7 million tonnes.[3]  For the approximately 80 percent of pellets intended for export, industry data show almost 70 percent of feedstock is “pulpwood,” meaning tree boles and large branches, while just 1.25 percent is from logging residues and around 30 percent is from mill residues.[4]  It is thus not the case, as is sometimes represented, that pellets exported from the US are predominantly made from “waste” wood.

As highlighted in the recently released Chatham House report,[5] even though burning wood pellets for electricity emits more carbon dioxide per megawatt-hour than burning coal,[6] the UK’s greenhouse gas accounting protocol ignores these emissions, assuming emissions are offset as forests regrow. However, to the extent that such regrowth occurs (and companies using and manufacturing biomass fuels are in no way required to guarantee forest regrowth) the decades to centuries this takes undermines efforts to reduce atmospheric carbon dioxide concentration now.

Subsidies for “carbon neutral” biomass have supported several new biomass plants and coal-to-biomass conversions in the UK and the EU, the largest being the 3,960 MW Drax plant in Yorkshire.  Drax burned 5.9 million tonnes of biomass in 2015, the majority provided by wood pellets imported from the US and Canada.[7]  Drax has converted half its generating capacity to biomass, meaning the facility now emits as much or more carbon as previously, but is only required to purchase half as many carbon allowances.  Direct emissions are only part of total carbon impact, however, because carbon is also emitted from wood and fossil fuels burned during pellet manufacturing and transport, below-ground tree biomass killed during forest harvesting, and soil disturbance. Beyond these direct emissions, foregone sequestration – the reduction in carbon sequestration capacity in forests cut for fuel – also increases atmospheric carbon loading.

As noted in a report published by the UK’s own Department of Energy and Climate Change,[8] reducing forest stocks releases carbon to the atmosphere, a factor the report said must be considered “if we wish to understand the true GHG intensities of different bioenergy feedstocks and technologies.”  Because the UK’s biomass policy does not consider changes in forest carbon, it does not measure up to the standard of the UK’s 2012 Bioenergy Policy, which states that biomass energy “should deliver genuine carbon reductions.”[9]

Biomass energy is costly to UK bill-payers.  Drax alone received subsidies worth nearly one and a quarter million pounds per day for its use of biomass in 2015,[10] and will receive more going forward as the EU has recently approved Drax’s existing conversion of a third unit from coal to biomass.[11]  Total UK subsidies for dedicated and co-fired biomass electricity[12] were over ₤807 million in 2015, and will increase as new bioenergy facilities are brought online, including the coal-to-biomass conversion at the 420 MW Lynmouth plant and the new 299 MW Teesside facility.  Over the period for which subsidies are promised, this amounts to many billions of pounds – even as the UK government is cutting subsidies for wind and solar power that generate truly zero-emissions power.

An EU-commissioned report[13] has reported that natural forests logged for biomass in the US are being converted to plantations, reducing biodiversity and causing “significant” losses of carbon. The report further acknowledges that “logging residues are not a significant feedstock for industrial wood pellets” and estimates that hundreds of thousands of hectares of whole trees are being harvested for pellet manufacture.  Nevertheless, while the EU recently proposed slight revisions to its biomass policies for 2020 onward,[14] it has not proposed to reform accounting for biogenic carbon or take other meaningful steps to reduce forest harvesting for biomass.

The failure of the EU to act increases the urgency that the UK abandon the EU’s profoundly flawed approach to biomass.  We accordingly urge the UK government to reform carbon accounting for bioenergy to appropriately weight current, measurable bioenergy carbon emissions over unsecured and hypothetical forest regrowth, and to end subsidies for large-scale wood-fueled bioenergy that injures forests and the climate. These bold steps would mark the UK as a climate and conservation leader, and save billions in public funds.

Thank you for your consideration.


Alessandro Agostini
ENEA – Centro Ricerche Casaccia Mary S. Booth
Partnership for Policy Integrity Robert Cabin
Assistant Professor of Ecology and Environmental Studies
Brevard College Stefano Caserini
Department of Civil and Environmental Engineering
Politecnico di Milano, Italy Eric Chivian, M.D.
Founder and Director Emeritus
Center for Health and the Global Environment
Harvard Medical School Norm Christensen
Environmental Science & Policy Division
Duke University Scott L Collins
Distinguished Professor
Loren Potter Chair of Plant Ecology
Department of Biology
University of New Mexico Gretchen C. Daily
Bing Professor of Environmental Science
Dept. of Biology and Woods Institute
Stanford University Eric A. Davidson,
Professor and Director
Appalachian Laboratory
University of Maryland Center for Environmental Science John M. DeCicco
University of Michigan Energy Institute (UMEI)
University of Michigan David Foster
Director, Harvard Forest
Harvard University Janet Franklin
Regents’ Professor
School of Geographical Sciences & Urban Planning
Arizona State University Lee E. Frelich
Director, Center for Forest Ecology
University of Minnesota Andrew J. Friedland
The Richard and Jane Pearl Professor in Environmental Studies
Environmental Studies Program
Dartmouth College James N. Galloway
Sidman P. Poole Professor of Environmental Sciences
University of Virginia Scot Goetz
Northern Arizona University Jessica Gurevitch, Ph.D
Department of Ecology and Evolution
Stony Brook University Helmut Haberl
Director, Institute of Social Ecology Vienna
Alpen-Adria Universitaet Klagenfurt, Wien, Graz
Austria Charles Halpern
Research Professor
University of Washington John Harte
Professor of Ecosystem Sciences
Energy and Resources Group
University of California, Berkeley Stuart Haszeldine  OBE FRSE C.Geol
Professor of Carbon Capture and Storage
University of Edinburgh Bjart Holtsmark
Research Department
Statistics Norway Richard A. Houghton
Senior Scientist
Woods Hole Research Center Michael Huston
Department of Biology
Texas State University Dennis H. Knight
Professor Emeritus of Botany and Ecology
University of Wyoming William F. Laurance, PhD, FAA, FAAAS, FRSQ
Distinguished Research Professor & Australian Laureate
Prince Bernhard Chair in International Nature Conservation
James Cook University Beverly Law
Professor Global Change Biology & Terrestrial Systems Science
Oregon State University Deborah Lawrence
Director, Food Fuel and Forests Global Program of Distinction
University of Virginia Dr. Peter J. Leggo
Research Scientist
Department of Earth Sciences
University of Cambridge Thomas Lovejoy
Department of Environmental Science and Policy
George Mason University David J. Mladenoff, PhD
Department of Forest & Wildlife Ecology
University of Wisconsin-Madison William R. Moomaw, PhD
Emeritus Professor of International Environmental Policy
Tufts University Michael O’Hare
Prof. of Public Policy
Goldman School of Public Policy
University of California Robert K. Peet
Professor of Biology
University of North Carolina at Chapel Hill Stuart Pimm
Doris Duke Professor of Conservation
Nicholas School of the Environment
Duke University Bill Platt
Dept. of Biological Sciences
Louisiana State University Richard Plevin, PhD
Research Scientist
Transportation Sustainability Research Center
Institute of Transportation Studies
University of California, Berkeley Dave Reay
Chair in Carbon Management
University of Edinburgh David W. Roberts
Professor and Head
Ecology Department
Montana State University G. Philip Robertson
University Distinguished Professor
Michigan State University and DOE Great Lakes Bioenergy Center Dr Simon Shackley
Programme Director for MSc in Carbon Management
School of GeoSciences, University of Edinburgh Joshua Schimel
Distinguished Professor
Department of Ecology, Evolution and Marine Biology
University of California Santa Barbara William H. Schlesinger
President Emeritus
Cary Institute of Ecosystem Studies, Millbrook, NY Tim Searchinger
Research Scholar
Princeton University Chris Thomas, PhD, FRS
Professor of Biology
University of York Julienne Stroeve
Earth Sciences
University College London Richard Thomas
Professor and Chair of Biology
West Virginia University Donald M. Waller
John T. Curtis Professor of Botany & Environmental Studies
University of Wisconsin-Madison Joy Ward
Dean’s Professor of the College of Liberal Arts and Sciences
University of Kansas Richard Waring
Department of Forest Ecosystems and Society
Oregon State University Alan Weakley
Director, UNC Herbarium
University of North Carolina at Chapel Hill David Wilcove
Professor of Ecology and Evolutionary Biology and Public Affairs
Woodrow Wilson School
Princeton University George M. Woodwell
Director Emeritus
The Woods Hole Research Center Zaichun Zhu
Department of Ecology
College of Urban and Environmental Sciences,
Peking University [1] Fuss, S., et al. 2014. Betting on Negative Emissions. Nature Climate Change 4, 850-853. doi:10.1038/nclimate2392

[2] The UK’s Ofgem biomass profiling data (at show that for FY 2014/2015, wood pellets and other woody biomass were imported to the UK from Canada, Estonia, Germany, Latvia, Poland, Portugal, South Africa, and the USA.

[3] Not all these facilities will be built, however.

[4] Ofgem data.

[5] Chatham House. The Impacts of the Demand for Woody Biomass for Power and Heat on Climate and Forests.  February 23, 2017.

[6] Data from Drax, the largest bioenergy plant in the UK, show that in 2013, the facility emitted 20,089,607 tonnes of CO2 from coal and generated 23.3 terawatt-hours of electricity, for an emission rate of 862 kg/MWh. Emissions from biomass were 2,799,391 tonnes CO2 and generation was 2.9 terawatt-hours, for an emission rate of 965 kg/MWh.  Since then, Drax has completed conversion of three of its six units to full-time operation on biomass Emissions numbers from Drax Annual Review of Environmental Performance, 2013 at page 8 (; generation numbers from Drax’s biomass supply document for 2013-2014, at page 2 (

[7] Drax’s 2015 Annual Report shows the total amount of biomass burned at page 17, at The sources and types of biomass burned in the UK are tracked by Ofgem, with data available at

[8] Stephenson, A.L., and MacKay, D.J.C.  2014.  Scenarios for assessing the greenhouse gas impacts and energy input requirements of using North American woody biomass for electricity generation in the UK.  Department of Energy & Climate Change, London, UK.  At

[9] UK Bioenergy Strategy, 2012. UK Department of Transport, Department of Energy and Climate Change, and Department for Environment, Food, and Rural Affairs. At page 6,

[10] Drax’s Annual Report shows the company received ₤451.8 million in renewable energy subsidies in 2015. At, page 35.

[11] European commission approves Drax biomass subsidy. The Guardian, Dec. 19, 2016. At

[12] Data on ROC allocation from The Renewable Energy Foundation, at The figure of ₤807 million excludes ROCs granted for waste burning, sewage gas, anaerobic digestion, and gasification.  Average 2015 ROC price calculated as ₤42.69, from

[13] Kittler, B. et al. 2016. Environmental implications of increased reliance of the EU on biomass from the South East US.  European Commission, December 2015.  At

[14] The EU’s revised Renewable Energy Directive is at  The biomass policy still does not count emissions if biomass is sourced from forests unless there is a permanent change in land-use, for instance if a forest is cut and the land is put into agriculture.

Partnership for Policy Integrity