
Re: For pity's sake: DON'T MOVE to the USA if you want to live
Err...why do they have signs pointing inwards?
2 publicly visible posts • joined 28 Jun 2013
"Yes climate has changed for 4 billion years and the factors include suns output, Milankovich Cycles (earths orbital eccentricities), greenhouse gases water vapor, carbon dioxide, methane etc.
Mostly the first 2 factors have been historically responsible for climate change but they have been exceedingly stable over the holocene (the period humans have existed)"
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No, no no. The Sun's output has followed a long-term increase as its internal burning structure changes. This is not to be confused with 11-year and other cycles which are essentially small signals superimposed on this trend.
Similary M-cycles have operated throughout Earth's history (though not necessarily with the current-day periodicity) but are not strong enough by themselves to force glacials. The current ice-age with extensive polar ice caps has come about primarily because of the change in continental configuration and also by the extraction of CO2 by continental weathering caused by the closure of the Tethys Ocean and the formation of mountain ranges from India to Greece.
In fact the M-cycles are now leading to a decrease in Northern Hemisphere insolation. The confirmation of this and the proof of the effect of these cycles was what lead to so-called predictions of an ice-age in the 70s. An ice age should start, all things being equal.