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Forests are a treasure trove of limbs
and bark that can be made into alternative fuels and some worry the
increasing trend of using that logging debris will make those
materials too scarce, harming the woodlands.


      For centuries, forests have provided lumber to build cities,
pulp for paper mills and a refuge for hunters, fishers and hikers.
A flurry of new, green ventures is fueling demand for trees and the
debris leftover when they are harvested, which is called waste wood
or woody biomass.


      "There simply is nowhere near enough waste wood for all of
these biomass projects that are popping up all over the place,"
said Marvin Roberson, a forest policy specialist with the Sierra
Club in Michigan.


      Waste wood has become a sought-after commodity, prompting
concerns that the demand might overwhelm supply and damage the
ecosystem. But government officials say there's plenty available
and they point to guidelines that are aimed at maintaining tree
debris to give the soil nutrients.


      Many biomass projects are tied to the forests that extend across
Minnesota, Wisconsin, Michigan and part of Ontario. Among them is
Flambeau River Papers, a mill in Park Falls, Wis., that emerged
from bankruptcy three years ago and is pinning its hopes for
profitability on generating its own heat with woody biomass.


      In another Wisconsin town 50 miles away, a power company is
switching from burning coal to producing combustible gas from
logging leftovers. And in Michigan's neighboring Upper Peninsula, a
plant under development called Frontier Renewable Resources will
convert timber into 40 million gallons of cellulosic ethanol a
year.


      Researchers led by University of Minnesota forest expert Dennis
Becker reported this summer that many would-be investors are uneasy
about supplies of waste wood.


      They fear environmental reviews and litigation could make some
public woodlands unreliable sources, particularly in the West,
where most forest lands are under federal ownership and logging
often raises legal tussles, the report said.


      Another problem with woody biomass is that much of the supply is
in protected areas, or so far from markets that removing and
transporting it would be too expensive, Becker said.


      He led a separate study that found a realistic estimate of
biomass available in Michigan, Minnesota and Wisconsin was 4.1
million tons a year. Annual demand soon could reach 5.7 million
tons, it said.


      "A lot of folks believe there's a significant amount of woody
biomass that can be used for renewable energy," Becker said. "In
reality, not everything that's physically available is economically
feasible or environmentally sustainable."


      State and federal officials say there's enough material left
over from harvesting the nation's forests to help reduce dependence
on foreign oil, curb greenhouse gases and build a green economy.


      A federal report says about 368 million tons of biomass could be
removed sustainably from U.S. forests each year. Agriculture
Secretary Tom Vilsack in August promised to spend $57 million on 30
projects supporting development of biofuels from trees.


      "Emerging markets for carbon and sustainable bioenergy will
provide landowners with expanded economic incentives to maintain
and restore forests," Vilsack said.


      Some schools, hospitals and utilities in the Great Lakes region
already use biomass for heat and electricity. Michigan Biomass, a
group representing six wood-fired power plants, fears the growing
interest will make fuel costlier and more scarce. Closure of lumber
and paper mills that were reliable suppliers of biomass has
worsened the problem, director Gary Melow said.


      "In the past four or five years, where we've seen a dramatic
decline in forest products manufacturing and in waste wood
availability, we've started to experience significant shortages,"
Melow said. "We've even had power plants that ran out of fuel."


      Roberson, with the Sierra Club in Michigan, said biomass
projects will end up using waste wood and logs suitable for paper
or other products.


      "We advocate getting the best economic return for industrial
use of the Midwest's forests, and there is no lower return than
throwing it in the furnace," Roberson said. "There are fewer jobs
per cord, per acre, from biomass than any other use."


      A biomass shortage could bring pressure on forest managers to
cultivate plantations of fast-growing species such as willows and
aspen at the expense of pines and hardwoods native to the region,
Roberson said.


      That's also a concern in the southeastern part of the country,
which will have to rely heavily on biomass to meet alternative
energy goals because it has less potential for wind power, said
Jimmie Powell, energy specialist for The Nature Conservancy.


      Roberson said biomass incineration, although an alternative to
greenhouse gas sources like oil and coal, still pollutes the air.
Removing too much woody debris, instead of letting it decay and
nourish soils, can damage the health of the forest, he said.


      A number of states have developed guidelines for collecting
biomass in a way that doesn't harm forests. Minnesota calls for
leaving 33 percent of fine woody debris in place, said Anna
Dirkswager, state biomass coordinator. Wisconsin recommends 20 to
25 percent remains for most locations.


      State officials acknowledge competition for biomass may
intensify but predict demand and supply will balance in time. One
reason: Not every project on the drawing board will come to pass.


      "Any time you have an emerging industry, there's concern that
everyone will go rushing into it and there will be too much
pressure on the resource," said Cara Boucher, Michigan's state
forester. "But the market shakes things out."

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Environmental News

Forests are a treasure trove of limbs
and bark that can be made into alternative fuels and some worry the
increasing trend of using that logging debris will make those
materials too scarce, harming the woodlands.


Are too many forests being cut down for biomass?

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