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<blockquote data-quote="Umbran" data-source="post: 9639759" data-attributes="member: 177">Time to note the Drake Equation:N = R* × fp × ne × fl × fi × fc × LWhereN, the number of civilizations currently transmitting signals, depends on seven factors:R* is the yearly formation rate of stars hospitable to planets where life could developfp is the fraction of those stars with planetsne is the number of planets per solar system with conditions suitable for lifefl is the fraction of planets suitable for life on which life actually appearsfi is the fraction of planets with life on which intelligent life emergesfc is the fraction of planets with intelligent life that develops technologies such as radio transmissions that we could detectL is the average length of time in years that civilizations produce such signsThere is more in heaven and on Earth than is imagined by your philosophy.&nbsp; Just because we formed civilization a particular way, doesn't mean everyone would.&nbsp; The geology isn't the hard bit.&nbsp; Burying things is easy.On Earth the abundance of fossil fuels is owed more to how there was a gap between when plants began using cellulose as a structural element, and when other organisms worked out ways to digest that same cellulose.&nbsp; Generations and generations of plants, and their carbon, that couldn't be digested by anything else, and so was still there to get buried.There are organisms on Earth now that can digest cellulose, so the process of producing fossil fuels has pretty much stopped.</blockquote>

[QUOTE="Umbran, post: 9639759, member: 177"] Time to note the Drake Equation: [B]N = [I]R*[/I] × [I]fp[/I] × [I]ne[/I] × [I]fl[/I] × [I]fi[/I] × [I]fc[/I] × L[/B] Where [B]N[/B], the number of civilizations currently transmitting signals, depends on seven factors: [B][I]R*[/I][/B] is the yearly formation rate of stars hospitable to planets where life could develop [B][I]fp[/I][/B] is the fraction of those stars with planets [B][I]ne[/I][/B] is the number of planets per solar system with conditions suitable for life [B][I]fl[/I][/B] is the fraction of planets suitable for life on which life actually appears [B][I]fi[/I] [/B]is the fraction of planets with life on which intelligent life emerges [B][I]fc[/I][/B] is the fraction of planets with intelligent life that develops technologies such as radio transmissions that we could detect [B]L[/B] is the average length of time in years that civilizations produce such signs There is more in heaven and on Earth than is imagined by your philosophy. Just because we formed civilization a particular way, doesn't mean everyone would. The geology isn't the hard bit. Burying things is easy. On Earth the abundance of fossil fuels is owed more to how there was a gap between when plants began using cellulose as a structural element, and when other organisms worked out ways to digest that same cellulose. Generations and generations of plants, and their carbon, that couldn't be digested by anything else, and so was still there to get buried. There are organisms on Earth now that can digest cellulose, so the process of producing fossil fuels has pretty much stopped. [/QUOTE]

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