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It is unfortunate that Dr. James Singmaster makes claims that appear plausible to those who do not understand the physics involved. What does he mean by ‘negative carbon’ and ‘negative heat energy’? Whilst there are sound grounds to support using biomass to provide some energy, it is ridiculous to even suggest that this can offset the loss of carbon sink due to de-forestation. The use of fossil fuels have released many billions of tonnes of carbon dioxide into the atmosphere and a lot of this has been absorbed in the oceans, causing acidification. Global cutting back on emissions will only slow the rate of increase in the level.