Murmur of the Breeze in the GM Trees?

An Israeli GM company is planning to improve the efficiency of wood production for paper production, pellet burning in electricity generating stations and even fuel manufacture for cars by planting Eucalyptus trees with inserted genes to enhance their growth (in terms of circumference) rate so they mature in 5.5 rather than 7 years (http://www.guardian.co.uk/environment/2012/nov/15/gm-trees-bred-world-energy?INTCMP=SRCH). The company reportedly suggest that countries with good growing conditions for the trees, in terms of climate and soil, could benefit economically. Brazil might be an obvious contender. Although the trees might help to reduce atmospheric concentrations of carbon dioxide when growing, it sounds as if their use is likely to put a lot of the greenhouse gas back. It should be noted that monocultures of plants (crops) are typically more prone to disease (although I suspect that the claim will be made that resistance can be rapidly engineered) than mixed assemblages. An area of concern is the obvious fact that areas of varied forest would have to be removed to make way for the GM planting. This would remove not only plant species but any the animal species associated with them, with obvious effects on biodiversity. I confidently predict that the GM Eucalyptus forests will not feature populations of Koalas!