Earth’s Overshoot Day fell on August 1 this year—the earliest ever. Even if the exact way of measuring is full of question marks the basic concept is certainly valid and the trend is unmistakable. “We are borrowing the Earth’s future resources to operate our economies in the present……To maintain our current appetite for resources, we would need the equivalent of 1.7 Earths” There are plenty of links in the story worth checking out.
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For the UK, this summer has been the driest since records began in 1961 (BBC). England has been a particularly dry country—see the photos.
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Also from BBC, a full-length and well-illustrated feature story about how part of the Aral Sea has been brought back to life. The sea today is just one-tenth of its original size, which was once 26,000 square miles, or about the same as Lake Erie. It was ruined mainly by gross mismanagement but is now seeing rescue efforts that are making progress.
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The current rash of heat waves in North America is not just about planetary warming. It involves an extremely weak north-side jet stream and a phenomenon known as the Atlantic Multidecadal Oscillation. “In fact, the situation is very like the one we had in 1976, when we had similar ocean temperatures in the Atlantic and an unchanging jet stream that left great areas of high pressure over many areas for long periods.” The warming that has occurred since 1976 makes all of the effects a little worse than they were then. It may seem strange, but average temperatures for the globe as a whole have not moved away from the ‘normal’ trend this summer.
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A new study establishes a close relationship between global warming and the population declines of birds and mammals. A total of 987 species were covered, each of them having populations in more than one location, which in each case were widely separated and experienced a different rate of warming over many years of study. Factors other than warming could not account for the observed pattern of declines. “Our research shows that in areas where the rate of climate warming is worse, we see more rapid bird and mammal population declines. Unless we can find ways to reduce future warming, we can expect these declines to be much worse.” A WWF study in 2016 reported that global animal abundance has generally declined by 58% since 1970.
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Climate science: In CL#1217 I posted a story about Jerry Mitrovica, a scientist who does pioneering work in the study of what happens when large mountains of ice melt down and thereby add to the oceans’ water content. There are some measurements involved that seem unbelievably large, which should whet anyone’s curiosity. I did a little checking and found a link with three videos of his presentations, two of them full lectures and one a short introduction to the subject with animated charts. Watch the short one, and then, if you like hearing a really good lecturer, who knows his stuff and has a lot to say, with first-rate graphics, set aside time for the others. Tomorrow I will follow up with a link to another study which shows how important this work is for making projections of future climate change.
Carl