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- Newsgroups: sci.astro
- Path: sparky!uunet!stanford.edu!CSD-NewsHost.Stanford.EDU!CSD-NewsHost!jmc
- From: jmc@SAIL.Stanford.EDU (John McCarthy)
- Subject: Averting doom
- Message-ID: <JMC.92Dec26004848@SAIL.Stanford.EDU>
- Sender: news@CSD-NewsHost.Stanford.EDU
- Reply-To: jmc@cs.Stanford.EDU
- Organization: Computer Science Department, Stanford University
- Date: 26 Dec 92 00:48:48
- Lines: 31
-
- The following squib is from U.P.
-
- Here's a cheery prediction from scientists at
- Pennsylvania State University. They say life on Earth as we
- know it will come to an end in one-and-a-half-BILLION
- years... and a BILLION years after that, the planet will
- look more like dusty volcanic Venus.
- Ken Caldeira and James Kasting calculated the
- doomsday estimates using computer models of temperature and
- atmosphere changes and projections of the sun's increasing
- heat. They say (in the British journal Nature) as the sun
- continues to brighten and warm, the amount of carbon dioxide
- in the atmosphere will drop- eventually to a point too low
- for plants to survive. As the temperature rises further, all
- water on Earth will boil off.
- But they say mirrors on Earth or shades in space
- potentially could shield our planet from increasing heat
- from the sun and delay the catastrophic consequences. Other
- possible solutions- building closed environments like the
- Biosphere Two project in Arizona... or setting up controlled
- Earth-like environments in space.
- -26-
-
- A more straightforward solution is to move the earth further from
- the sun as the sun warms up. What are the easiest ways of doing
- this?
- --
- John McCarthy, Computer Science Department, Stanford, CA 94305
- *
- He who refuses to do arithmetic is doomed to talk nonsense.
-
-