Sentences with phrase «without human fossils»

The ancient stone tools were found without human fossils so it is unclear whether they were developed in the same location or were brought along with a migrating population, according to archaeologists.

Not exact matches

Plus, humans could had ridden camels alone without cargo long before using them for cargo, where a human weight alone is a much lighter load than with cargo, that it might not show load stress in previous fossils, let alone that those projected camels are only the known ones by archeologists.

The new tooth also contains DNA unlike that of Neandertals or modern humans, suggesting that Denisovans interbred with an even more mysterious branch of the human family tree — one that is either unknown to science, or known only from fossils without preserved DNA.

These same critics argue that without an age for the fossils, Rising Star's ability to shed light on the course of human evolution is limited.

However, because of the nature of the chamber sediments and the lack of other animal remains at the site, the researchers have not yet been able to nail down the exact age of these fossils, without which «there's no way we can judge the evolutionary significance of this find,» Rick Potts, director of the human origins program at the Smithsonian Institution's Natural History Museum, who was not involved in the discovery, told the Associated Press.

That's what scientists who study ancient humans will likely be doing following the revelation of a new technique that enables the recovery of hominin DNA directly from sediments without the need for fossils.

Without the fossil evidence, however, the LCA of chimps and humans will have to remain a dot on a clade and a phantom face on a computer screen.

However, reams of peer - reviewed research, basic physics, the ability to track the specific chemical fingerprint of fossil fuel - driven carbon, and the fact that no models can replicate this century's warming without pumping up carbon dioxide and other greenhouse gases in the atmosphere give scientists confidence that human carbon emissions are driving the globe's temperature higher.

«It's possible we'll one day find three groups of hominin fossils — those with Gc - CS before the human lineage branched off, those without Gc - CS in our direct lineage, and then more recent fossils in which trace amounts of Gc - CS began to reappear when our ancestors began eating red meat,» Varki said.

Are these portraits, perhaps, of the end of the age of unfettered consumption, simply a short pause before human communities resume their 150 - years - and - counting fossil - fueled sprint, or a foretaste of Alan Weisman «s 2007 thought experiment, «The World Without Us»?

Due to the irreversible physical and chemical processes converting biomass to fossils the amount of carbon available in the biosphere is steadily diminishing and, on a geological time scale, it is certain that without human intervention it would eventually lead to critical shortage of carbon available for life on Earth.

The trick is to use the chemicals without human or environmental exposures, thereby producing a material that is itself environmentally beneficial by breaking our reliance on fossil fuels.

and just maybe, without abundant fossil fuels the human carrying capacity of the earth has been egregiously exceeded.

Without releases from fossil fuels and other human activities the concentration would be about 125 ppm less.

He has published scores of articles insisting that global warming isn't caused by humans, and suggesting that we can carry on burning fossil fuels without regard for the climate.

Current concentrations of the primary greenhouse gases (see above) can not be accounted for without considering human activities, particularly the combustion of fossil fuels.

US researchers report in the journal Nature that they collected fossil pollens from 642 ponds and lake beds across Europe and North America, to provide a record of local temperature shifts in the last 11,700 years, to conclude that — without global warming as a consequence of profligate human use of fossil fuels — the world ought to be in a cool phase.

A large number of risks exist that incent reducing atmospheric pCO2, and human emissions of fossil carbon, as quickly as possible without impacting other important considerations.

I have focussed on the real energy fraud that the claim climate change = CO2 from humans supports, hence the easy money climate change protection racket of renewable energy policy = unsustainable without fossil and nuclear, in scsience fact.

The waste products of the world might come from consumption, heating, agriculture, mining, manufacturing, fossil fuel extraction, transportation, or some other human activity and without some form of control, they will degrade the environment as they accumulate or disperse.

Fossil fuel companies are not the same as cigarette companies because without one there is one fewer vice, and probably a lot less cancer in the human population.