Thick boreal forests in Alberta are disappearing. They are being converted to grassland and open deciduous forest, via a combination of drought and wildfire. Researchers are looking for conversion of half to possibly 75% of Alberta’s current forests in this century.
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Humans successfully adapted to steep, rapid climate change on many occasions in the past. This story is based on archaeological findings at a Middle Stone Age site in Britain. Unlike today, the problems then were associated with extreme cold events brought on by surges of meltwater into the North Atlantic during the final stages of ice sheet decay. (Some scientists wonder whether something like it, but on a smaller scale, could occur in the event of a rapid breakdown of Greenland’s ice sheet.)
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Large opportunities for energy conservation are available, and need promotion. Reducing energy demand reduces emissions just as effectively as adding renewable sources, and has similar potential in areas such as lighting and appliances, at no net cost to consumers.
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A new Gallup poll shows that American views on climate change are more politicized than ever. There is an overall decline in acceptance of standard science-based conceptions, entirely expressed by changes found among Republicans and Independents. In the case of Independents, since party loyalty would presumably not be a factor, the decline can mostly be ascribed to the effectiveness of propaganda efforts undertaken by oil interests and their allies.
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Followup to the story in yesterday’s letter about the projected effects of future permafrost melting. The link below provides access to the full study, which explains why the authors conclude that large releases of CO2, up to a point, will have little or no effect on global warming. In short, they believe equal amounts of carbon, or even more, will be consumed by the increased greening of biomass that is fertilized by the augmented CO2 level. They admit that some uncertainties are involved in that forecast, and that not all scientists are ready to go along. I believe those other scientists need to have their reasons heard before any final conclusions are drawn. Other than that, their conclusion that cutting back sharply on human emissions will have benefits cannot be faulted.
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Here is a full-length magazine article about how permafrost studies on Alaska’s North Slope are conducted. The photography is great, and there are comments from several of the very same scientists who were among the authors of the preceding study. The story has a lot to say about how much carbon will be released, but, strangely, nothing at all about how it will be taken up again by a biomass sink.
Carl