Predictions for global greening due to higher CO2 levels may be overestimated. A new study shows that vegetation growing in soils that are low in phosphorus do not grow any faster when CO2 rises. Such soils are common to tropical and subtropical regions. Soils that are rich in phosphorus do not have this limitation, but their total is not as high as the amount assumed by current climate models. That change may be enough to affect the size of the carbon budget reserved for human usage.
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New attention has been drawn to the abrupt shift in the seasonal pattern of Antarctic sea ice extent. Within about a year it has changed from comfortably high to extraordinary record lows. In this post several scientists offer their opinions about what this means and what to expect in the way of effects on global climate. Loss of albedo is just one of a number of important consequences.
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Arctic sea ice, meanwhile, has constantly been declining in extent, including a new 2017 low for all months of just February. Ice extent is now passing through its annual seasonal peak, with ultimate lows normally arriving in September.
—Complete daily historical chart records for ice at both poles are available at this site:
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Wasted food by itself accounts for 8% of greenhouse gas emissions. Eliminating that waste would directly benefit the climate as well as providing substantial benefits of several other kinds. Many organizations have been formed with that goal in mind, and all individuals are invited to participate.
—Companies that act to eliminate their own food waste reap huge financial returns:
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A revolutionary new theory about the Earth’s greatest mass extinction. It seems that an extreme ice age was first involved as dust from the Siberian Traps blocked out the sun, followed later by a period of intense warming. The credibility of supporting evidence outlined in the study is at least respectable.
Carl