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The burning of fossil fuels by humans is the largest source of emissions of carbon dioxide, which is one of the greenhouse gases that allows radiative forcing and contributes to global warming.

A small portion of hydrocarbon-based fuels are biofuels derived from atmospheric carbon dioxide, and thus do not increase the net amount of carbon dioxide in the atmosphere.

This measures the amount of the radioactive isotope carbon-14 (C) in the sample.

There is a certain amount of carbon-14 in all organic matter, and over time it breaks down into carbon-12 or regular non-radioactive carbon. Unfortunately carbon dating is only accurate to 50,000 years with an error of ±500 years. One key problem with isotopic dating (carbon dating) is that it assumes that carbon-14 breaks down to carbon-12 at a constant rate.

— The heat generated by burning a fossil fuel is surpassed within a few months by the warming caused by the release of its carbon dioxide into the atmosphere, a new study says. — Weaning cars and trucks off of gasoline and diesel made from fossil fuels is a difficult task.

One promising solution involves biodiesel, which comes from natural oils and fats, but it is costly. — Renewable fuels from pyrolysis bio-oil has been created by researchers.

It had the rounded skull case but retained the large brow ridges of archaic humans.

Somewhat more advanced transitional forms have been found at Laetoli in Tanzania dating to about 120,000 years ago.

It would seem from these dates that the location of initial modern Homo sapiens evolution and the direction of their dispersion from that area is obvious. Since the early 1980's, there have been two leading contradictory models that attempt to explain.Their cranial capacities were up to 1590 cm A 195,000 year old fossil from the Omo 1 site in Ethiopia shows the beginnings of the skull changes that we associate with modern people, including a rounded skull case and possibly a projecting chin.A 160,000 year old skull from the Herto site in the Middle Awash area of Ethiopia also seems to be at the early stages of this transition. Their skeletons and musculature generally were less massive than the Neandertals.The Cro-Magnon had broad, small faces with pointed chins and high foreheads.By 115,000 years ago, early modern humans had expanded their range to South Africa and into Southwest Asia (Israel) shortly after 100,000 years ago.


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