As promised, more from the pages of Nature tonight.
3… For decades, scientists have attempted to solve the “faint young sun paradox” by proposing higher concentrations of greenhouse gases, specifically carbon dioxide and methane. But a paper last April claimed this wasn’t the case, and that carbon dioxide concentrations were no higher than modern-day values. The authors (Rosing, Bird, Sleep, and Bjerrum) solved the paradox with a cloud-free, ocean-covered Earth that was darker and absorbed more radiation. Well, today Nature printed three separate critiques of the work, and a reply by the authors. If that weren’t enough, the models in the