New research confirms the overwhelming need for humans to plant more trees. The work reported in this post from a British newspaper has done comprehensive studies that find a number of interesting things not widely recognized. One is that 3 trillion trees now exist on the globe, containing 400 billion tons of carbon in storage. Second, there is available room, with no inconvenience to anyone, for growing another 1.2 trillion trees, presumably capable of storing 40% more carbon, or another 160 billion tons, upon reaching maturity. That number is about equal to 15 years’ worth of all the carbon released to the atmosphere by current human activity.
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A different report about another aspect of work done by the same research group highlights a more disturbing type of information, which concerns the potential losses of soil carbon to the atmosphere because of the expected thawing of permafrost in the Arctic. “Under a business-as-usual climate scenario, the Crowther lab model suggests that warming would drive the loss of ~55 gigatons of carbon from the upper soil horizons by 2050.” That would offset a large chunk of what can be accomplished by planting trees, but also doubles down on the urgency of reasons for pursuing a planting program.
Relative to the above information, a study was published last week that updates what we know about what happens to all of the carbon that is emitted each year by human activity. The authors have tried to show how little of it actually ends up in the sink identified as the “terrestrial biosphere,” an amount that is impossible to measure outright and also difficult to estimate with confidence. That potentially large sink is known to lose about 1.3 billion tons of carbon each year to changes in land use, like deforestation, that could be avoided. Further analysis shows that an additional total of 1.5 billion tons ends up being deposited in a number of less-prominent locations, other than the biosphere, that can each be estimated but are too often just overlooked. The net result is that the biosphere is in fact still “greening” because of the extra CO2 that has a fertilizing effect, but just not very much, taking up less than 1 billion tons per year. That sink could be greatly magnified by planting trees, improvements in land use and so on, things that are well within the reach of human capability, if organized and delivered, at very low cost.
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An encouraging report on the growth of demand for electric cars, “As of early 2019 there are now 5.6 million electric vehicles on the road worldwide, a 64 per cent increase from the same time in 2018, and the second year in a row to see unprecedented growth in the burgeoning zero emissions transport market…..China and the USA are leading the charge, so to speak, with China undisputedly at number one with 2.6 million EVs, having practically doubled its EV fleet from 1,354,000 EVs on the road a year ago.”
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Why the rise in methane emissions is so worrisome (The Guardian). Methane growth in the atmosphere over the last few years has been strengthening when it should have been slowing. “Dramatic rises in atmospheric methane are threatening to derail plans to hold global temperature rises to 2C, scientists have warned…..And even more significantly, we do not really know why…..Perhaps emissions are growing or perhaps the problem is due to the fact that our atmosphere is losing its ability to break down methane…..Either way we are facing a very worrying problem.”
Carl