[extropy-chat] Re: Animals

[Eugen Leitl]

On Fri, Feb 13, 2004 at 01:33:23AM +0000, Christian Weisgerber wrote:

> Reference?
> (I can't find anything on this.)

http://www-astronomy.mps.ohio-state.edu/~pogge/Ast162/Unit3/thesun.html

says 

Mid-Life Crisis for the Earth

5.6 Gyr (1.1 Gyr from today):

    * Sun 10% brighter: ~1.1 Lsun
    * Cause a moist greenhouse effect on Earth, driving away most of the
    * water in the air. 

9 Gyr (3.5 Gyr from today):

    * Sun 40% brighter: ~1.4 Lsun
    * Oceans totally evaporate in a runaway greenhouse effect: Earth like
    * Venus today. 

I have no idea how reliable is this. Even 1% of solar constant change
typically can wreak havoc to climate, so 10% increase sounds pretty
catastrophic to me.

-- Eugen* Leitl <a href="http://leitl.org">leitl</a>
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