February 26, 2017
To folks with whom I occasionally discuss "Global Warming" or "climate change," here's a fascinating article I just found. For once, we aren't the bad guys. I quote a few paragraphs following:
Plumbing a 90 million-year-old layer cake of sedimentary rock in Colorado, a team of scientists from the University of Wisconsinâ€“Madison and Northwestern University has found evidence confirming a critical theory of how the planets in our solar system behave in their orbits around the sun.
The finding, published Feb. 23, 2017 in the journal Nature, is important because it provides the first hard proof for what scientists call the "chaotic solar system,â€ a theory proposed in 1989 to account for small variations in the present conditions of the solar system. The variations, playing out over many millions of years, produce big changes in our planetâ€™s climate â€” changes that can be reflected in the rocks that record Earthâ€™s history.
The discovery promises not only a better understanding of the mechanics of the solar system, but also a more precise measuring stick for geologic time. Moreover, it offers a better understanding of the link between orbital variations and climate change over geologic time scales.
In the context of the solar system, the phenomenon occurs when two orbiting bodies periodically tug at one another, as occurs when a planet in its track around the sun passes in relative proximity to another planet in its own orbit. These small but regular ticks in a planetâ€™s orbit can exert big changes on the location and orientation of a planet on its axis relative to the sun and, accordingly, change the amount of solar radiation a planet receives over a given area. Where and how much solar radiation a planet gets is a key driver of climate.
Guys, I hope I have whetted your appetite to read the whole thing! It's at http://news.wisc.edu/from-rocks-in-colorado-evidence-of-a-chaotic-solar-system/
And there's nothing about Carbon Dioxide, SUV's, or any of that stuff in it!
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