New research suggests that planting forests in northern boreal regions may not always reduce global warming. While trees absorb carbon, dark canopies can absorb sunlight that would otherwise reflect off snow, potentially warming the local environment. The net impact depends on a complex balance between this warming effect and the cooling provided by organic aerosols that help form clouds. This means carbon only accounting may lead to planting trees in areas where they actually increase warming.
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This is a classic case of policy intent ignoring implementation physics. Carbon only accounting is too simple. If the market keeps funding offsets in peatlands or permafrost zones without accounting for albedo, we are just trading one problem for another.
Exactly. The 2 Billion Trees Program is a huge headline, but the actual climate math depends on the site. Planting the wrong species in a high snow area is a net loss.
The cooling effect from BVOCs sounds like a convenient variable to balance the books, but the article admits it is based on models, not direct measurements. How many actual monitoring stations are we talking about in the boreal zone?
That is the gap. We have plenty of satellite data, but it is noisy over snow. Until we get ground truth, these carbon credits are basically guesses.
