How Green is Your Chainsaw?



Bronson Griscom is the director of forest carbon science at The Nature Conservancy.

Can a chainsaw be green? It sounds ridiculous, and in many cases it is.

Yet sustainable logging is the premise of The Nature Conservancy’s production forest strategy in the district of Berau in eastern Borneo, Indonesia — a strategy based on the notion that loggers themselves can be a critical ally in helping us maintain biodiversity and mitigate climate change in tropical forests.

Our findings in a new study in the journal of Global Change Biology show that we can measure how green your chainsaw is — step 1 in our plans to green-up commercial logging operations.

But first, some context. The Conservancy is partnering with commercial loggers in Berau who manage one-half of the forests there — about 4 million acres, much of which is habitat for the endangered Bornean Orangutan.  In doing so, we aim to reduce damage to trees in these forests — and resulting CO2 emissions from that damage — by 50%.  Further, we aim to pioneer with our partners a conservation strategy that could be applied to vast areas of remaining tropical forests: over 20% of all tropical forests are designated for commercial logging — more than twice the area set aside as protected areas.

Logging operation in Borneo. Photo Credit: Bronson Griscom.

Logging operation in Borneo. Photo Credit: Bronson Griscom.

Our strategy is based on three critical assumptions: 1) reduced impact logging (RIL) results in significant and measurable climate benefits; 2) sustainably logged forests sustain healthy populations of native species (everything from orchids to hornbills to orangutans); and 3) loggers can help reduce deforestation.  As discussed in a previous blog, recent studies support assumptions 2 and 3 (Putz et al. 2012, Gaveau et al. 2013), although a debate continues on whether we should seek alliances with commercial loggers (Kormos and Zimmerman, in press).

Our new article takes on assumption 1 with extensive field data across nine logging concessions in eastern Borneo. The good news is: we developed an affordable method for measuring the emissions performance of logging concessions, and this method points to large opportunities for reducing emissions from logging without reducing timber production and jobs.

This new method should solve a practical problem: there has been to date no mechanism available to verify (and monetize) emissions reductions from RIL in tropical forests. Building on the paper above, we are working with the Tropical Forest Foundation and TerraCarbon to develop a new RIL-Carbon methodology for the leading voluntary carbon standard (Verified Carbon Standard – VCS).  This will offer a robust verification mechanism for commercial loggers to generate carbon credits when they implement low impact logging practices that reduce carbon pollution.  Our goal is to help governments link this type of verification method with regulations and incentives at a national scale as part of green development programs.

Now for the bad news: we found no shining examples of consistently low-emissions logging practices in eastern Borneo, even though three of the nine concessions we sampled were certified by the Forest Stewardship Council (FSC).  FSC concessions did demonstrate impressive improvements in some logging practices, such as low-impact skidding of logs. But these benefits were swamped by unnecessary emissions from other sloppy logging practices found in FSC concessions – even ones that should save money if fixed.

We hope that our new measurement methods will alert FSC to some blind spots in their standards that could help FSC certificate holders achieve large and measurable climate benefits — a concept we have dubbed “RIL-C.” I want to stress that the Conservancy remains stalwart supporters of FSC because of a host of other benefits certification provides in these forests — such as social equity, legality, and environmental benefits like protection of high conservation value forests within logging concessions.  If FSC can make the changes we suggest, they can claim not only a range of environmental, legal, and social benefits, but also climate benefits.

Our new method is one example of the next generation of conservation measurement tools that are revealing large conservation opportunities — and all the work ahead of us to realize them.


Gaveau D, Kshatriya M, Sheil D, Sloan S, Molidena E, Wijaya A, Wich S, Ancrenaz M. 2013. Reconciling forest conservation and logging in Indonesian Borneo. PLOS ONE. 8 (8)

Kormos C, Zimmerman B. In press. Response to: Putz et al., Sustaining conservation values in selectively logged tropical forests: The attained and the attainable, Volume 5, Issue 4, August 2012. Conservation Letters DOI: 10.1111/conl.12043

Putz, F.E., P.A. Zuidema, T. Synnott, M. Peña-Claros, M. A. Pinard, Douglas Sheil, J. K. Vanclay, P. Sist, S. Gourlet-Fleury, B. Griscom, J. Palmer, and R. Zagt. 2012. Sustaining conservation values in selectively logged tropical forests: The attained and the attainable. Conservation Letters 5(4): 296-303

Opinions expressed on Cool Green Science and in any corresponding comments are the personal opinions of the original authors and do not necessarily reflect the views of The Nature Conservancy.
Bronson Griscom serves as Director of Forest Carbon Science for the Climate Team at The Nature Conservancy (TNC). The team’s research measures the success of TNC’s tropical forest conservation programs in Indonesia, Brazil, and Mexico in counter-acting climate change. Bronson designs and implements research to quantify the success of conservation initiatives in reducing CO2 in our atmosphere by storing carbon in forests. He completed a Ph.D. in tropical forest ecology from the Yale School of Forestry and Environmental Studies in 2003.

Comments: How Green is Your Chainsaw?

  •  Comment from Delon M

    Nice stuff Bronson, I wish this initiative will be responded and supported by other stakeholders… lets rock this stuff :)….

  •  Comment from Leon

    Excellent initiative, Brinson. As a child nearly 50 years ago I learnt about how important these forests were to climate and what the effect of cutting them down would be. If it was known then, why start cutting them down…… greed , just plain greed and arrogance. Human beings are the only species who actively work at destroying this planet. The arrogance being that we believe we can destroy these forests and and the next generation will be able to fix the hole we got ourselves into

  •  Comment from best chainsaw reivews

    Forest exploitation may cause adverse impacts on the environment, human and animal. made global warming due to the greenhouse effect, causing floods. I disagree forest exploitation

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