A report published in Science magazine on 23rd December suggests that where fast growing conifer plantations have been planted there is often significant damage to local water supplies. Sometimes that damage can be long-term reducing local water supplies, and making them saltier and more acidic.
I've long been suspicious of tree planting schemes as a way of supposedly offsetting Carbon emissions. Wouldn't many of those trees have been planted anyhow? I have too often seen these offsets used as a means of greenwashing a business and easing consciences. Well here's another good reason to steer clear of tree-planting schemes and focus on real measures that genuinely reduce greenhouse gas emissions. 
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