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Hi Andrew - I also have a vested interest in trees (I have just completed my PhD at the Institute of Forest Growth in Freiburg) and I just want to point out that of course, in general, trees are a good thing, but they do have disadvantages too. For example, non-site adapted species can be detrimental to timber production and local ecology, and can also be very susceptible to pathogens and storm damage - for example the use of spruce in many central European countries. The use of the incorrect species can have a massive effect on the local hydrological cycle. For example the use of eucalypts in Spain and Portugal which can notably reduce the local water table. Also, in the generation of HEP (Hydro-Electric Power), for example in Wales where the removal of forests can improve the production of HEP since there is less water being removed from the system by the trees' evapotranspiration. The decisions about how, where and how many trees to plant has profound consequences on the environment, and is not a decision that should be made lightly. I am in full support of improving the environment, but it needs to be a well considered approach, and one that does not jeopardise the future health and vitality of the associated ecosystems.