the populations fell dramatically and never recovered,” he says, and continues: “For the past 800,000 years, the globe has fluctuated(波动)between ice ages and interglacial periods about every 100,000 years.If the climate was the cause, we should see greater fluctuations when the climate cha...
They indicate that insect species show a remarkable degree of stability throughout the Ice Age climatic oscillations. The paradox arises from the apparent contradiction between abundant evidence of incipient speciation in insect populations at the present day and the evidence that, in the geological ...
Deglaciation in the tropical Indian Ocean driven by interplay between the regional monsoon and global teleconnections High resolution climate records of the ice age terminations from monsoon-dominated regions reveal the interplay of regional and global driving forces. Spel... Rajeev,Saraswat,David,......
The announcer, whose name was Ralph Story, said something that caught my 2 .“All great discoveries,”he said,“are made by people between the ages of twenty-five and thirty.” 3 a little over thirty myself, I wanted to disagree with him. 4 wants to think that he is past the age ...
What drives the ice age cycle? Between 3 and 1 million years ago, ice ages followed a 41,000-year cycle. Two studies provide new explanations for this periodicity.(ATMOSPHERE)The exposure of Earth's surface to the Sun's rays (or insolation) varies on time scales of thousands of years ...
East African megadroughts between 135 and 75 thousand years ago and bearing on early-modern human origins The environmental backdrop to the evolution and spread of early Homo sapiens in East Africa is known mainly from isolated outcrops and distant marine sedim... CA Scholz,TC Johnson,AS Cohen...
4b). The final stage of the pre-industrial period is thus defined by the plateau in temperatures between 1840 and the early 1860s, at marginally warmer (∼0.1 °C) pre-industrial temperatures compared to the 1700s. The sclerosponge record (Fig. 4b) of these well-known historic ...
Eccentricity pacing and rapid termination of the early Antarctic ice ages record to other records for the time interval between 28 and 20 million years ago, when Earth was warmer than today, and only Antarctic ice sheets ... TEV Peer,D Liebrand,VE Taylor,... - 《Nature Communications》 被...
Disparity in life expectancy between men and women also widened last year to the highest in over two decades, with men now expected to live 73.2 years, nearly six fewer years than women. 2021年,美国男性和女性之间的预期寿命差距也扩大到了20多年来的最高水平。目前,美国男性的预期寿命为73.2岁,比...
Gassner S, Gobet E, Schwörer C et al (2020) 20,000 years of interactions between climate, vegetation and land use in Northern Greece. Veget Hist Archaeobot 29:75–90 Article Google Scholar Gavin DG (2001) Estimation of inbuilt age in radiocarbon ages of soil charcoal for fire history...