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Tag Archives: trees

Biomass and renewable gas

By Dave Elliott

Not everyone backs biomass, given the emission/biodiversity/land-use issues, but  biomass does offer a range of flexible green fuel options, biogas especially.  The World Bioenergy Association (WBA) says bioenergy already contributes over 14% to the global energy mix, and its use is bound to expand.  So what are the options? (more…)

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Imported wood combustion? Some say it’s fine..others disagree

By Dave Elliott

Many environmentalists are not keen on using imported wood pellets in old inefficient converted fossil-fueled plants. They say there are better ways to use biomass and better sources- local anaerobic digestion of biomass wastes and residues, along with Combined Heat and Power (CHP). Large-scale biomass conversion, and even co-firing with coal, is sometimes portrayed as an interim option, getting biomass use established, but not everyone is convinced that this helps build up support for local sourcing of biomass. It’s just a way to keep old power plants going, so as to avoid having to write off some sunk costs.  There is also the wider debate about the extent to which large-scale combustion of grown biomass, especially from forests, is net low carbon, given that it takes time for new growths to absorb emitted CO2. It’s even been claimed that using wood from trees might lead to more emissions net than from using coal, depending on the source of the wood: http://www.rspb.org.uk/Image/biomass_report_tcm9-326672.pdf 

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Bioenergy is good

by Dave Elliott

In a new book ‘The Sleeping Giant Awakens-Bioenergy in the UK’ (Alba press), Stewart Boyle, a former green activist turned energy consultant and woodland owner, who has worked in the bioenergy sector for 12 years, sets out a strong critique of the current status of bioenergy in the UK. Controversially, he takes issue with the conclusions of some green pressure groups who have of late opposed reliance on biomass. ‘Having reviewed the science and the arguments, I feel that some of the NGOs have lost the plot on bio-energy and are using really bad science without thinking through their long term energy strategy.’  He claims the UK could get at least 10% and maybe over 20% of its energy frombioenergy in heat, transport, power and bio-chemicals.

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EGU 2013: tree spotted in poster halls

By Liz Kalaugher

It’s not often you see vegetation at the Austria Center Vienna, particularly inside the poster halls. But this year Rolf Hut of Delft University of Technology in the Netherlands positioned one of his research subjects, a tree, next to his poster display.

While an unexpected encounter with plants can be pleasant for conference delegates, for those interested in measuring the moisture content in the top 5 or 6 cm of soil by satellite, vegetation can be a problem. The water it contains may be a source of noise in the radar backscatter signals they need, particularly as plants’ water content tends to fluctuate during the day.

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