© mugley / flickr
Tiny mosses and liverworts were greening the earth much earlier than previously thought.
Earth's landmasses in the late Precambrian probably weren't pleasant, but at least they were green. A new analysis of limestone rocks laid down between 1 billion and 500 million years ago suggests that there was extensive plant life on land much earlier than previously thought.
The plants were only tiny mosses and liverworts, but they would have had a profound effect on the planet. They turned the hitherto barren Earth green, created the first soils and pumped oxygen into the atmosphere, laying the foundations for animals to evolve in the Cambrian explosion that started 542 million years ago.
It was already known from genetic evidence that mosses and liverworts probably evolved around 700 million years ago, but up till now there was little sign that they had colonised land to any great extent. The assumption was that terrestrial life consisted of patchy bacterial mats and "algal scum" until the mid-Ordovician, 475 million years ago, when land was first invaded by modern-looking vascular plants.
Paul Knauth of Arizona State University and Martin Kennedy of the University of California, Riverside, examined the chemical composition of all known limestones dating from the Neoproterozoic era, which stretched from 1 billion years ago up to the start of the Cambrian. Knauth says the balance of carbon-12 to oxygen-18 in the limestones is "screaming" that they were laid down in shallow seas that received extensive rainwater run-off from a land surface thick with vegetation.
Comment: A bit of spin, not necessarily for global warming per se, but for diverting attention from the opposite of "regularity and occasional abruptness of global warming", that is a new Ice Age. Nicely done.
The fact is, Earth's climate is in a constant state of flux, of which we can observe only a small part: What everyone avoids saying is that the climate can switch back equally fast. Just think about flash-frozen mammoths.