Update on the atmospheric CO2 level. The graph in this link (scroll down) is unique from the standpoint of how daily results so far in 2019 are widely scattered with no sense of direction. April is always a little like that so don’t look for anything different in the month ahead. We can still expect to see everything come together and form a normal turning point in mid-May, but where that turning point will lie is impossible to foresee. We can still hope it will not be higher than 414 ppm, which would keep it on the same track so far experienced in this century, but it is hard to hope for anything much better, which we badly need.
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Severe bleaching on the world’s southern-most coral reef (The Guardian). Lord Howe Island is a world heritage site that lies in the Tasman Sea off the southeast coast of Australia, farther south than the Great Barrier Reef. The bleaching event that occurred this last summer, caused by warmer ocean water, was the worst ever seen. “Our concern now is we’re going to start seeing coral mortality.”
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New temperature records are being set in Alaska (The Hill). Just recently it was the earliest day of the year to reach a high of 70F. Alaska is the nation’s fastest warming state, which is in keeping with the warming pattern seen in all other regions above or near the Arctic Circle.
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A new study from Max Planck Institute discusses several effects of removing the aerosol pollutants associated with burning fossil fuels, once the burning has stopped. The most important of these is the expected global drop of some 3 million premature deaths per year from disease prevention. The study also looked at the cooling effect of aerosol pollution that reflects sunlight, which it currently estimates to be 0.5C. The loss of that effect would need to be offset in order to avoid a similar, fast-acting amount of temperature increase. Toward that end, “The rise in temperature resulting from the removal of pollution particles from the air can be tempered by a simultaneous reduction of the greenhouse gases methane, ozone and hydrofluorocarbons in the troposphere.” Possible changes in rainfall patterns are also discussed.
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A major new European study has found reasons to believe that the behavior of individuals can make a substantial difference in climate mitigation, if properly encouraged. “The study notes that voluntary lifestyle choices by well-meaning individuals would only achieve around half the required emission reductions needed to hit the 1.5 C Paris Agreement goal. But the authors suggest that Paris targets could be achieved if voluntary choices were combined with policies that target behavioural change, particularly around eating meat and using fewer cars and airplanes.” The details are well-described and can be put to immediate use by activist campaigns.
Carl