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<div>Our sun will eventually cause fatal increases in Earth temperature in its inevitable evolution into a red giant star. When will these temperature impacts become significant? The article below estimates that in 800 million years the sun's impact will raise Earth temperatures by 5 degrees, the same amount predicted by some global warming models for the human impact on global temperatures in the next century:
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<div><a href="http://www.sussex.ac.uk/press_office/media/media191.pdf">http://www.sussex.ac.uk/press_office/media/media191.pdf</a></div>
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<div><a href="http://72.14.253.104/search?q=cache:hAqjwfgBKT4J:www.sussex.ac.uk/press_office/media/media191.pdf+time+remaining+Earth+biosphere+sun+expansion&hl=en&ct=clnk&cd=6&gl=us">http://72.14.253.104/search?q=cache:hAqjwfgBKT4J:www.sussex.ac.uk/press_office/media/media191.pdf+time+remaining+Earth+biosphere+sun+expansion&hl=en&ct=clnk&cd=6&gl=us
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<div>"As a first application, let us ask how long it will take for the temperature of the Earth to rise by 5 degrees (the rise anticipated in the next century or so if the current human-induced greenhouse effect continues unchecked). The equation predicts it will take the evolving sun about about
0.8 billion years to produce this rise- so human activity may be accelerating astronomical effects by a factor of about 10 million."</div>
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<div>This puts the highly doubtful claim that the current warming trend on Earth is mostly due to increases in solar activity into perspective, it seems.</div>
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<div>Ted Moffett</div>
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