Sentences with phrase «geological time during»

According to the dictionary's definition, the Anthropocene is «the era of geological time during which human activity is considered to be the dominant influence on the environment, climate, and ecology of the earth.»

Not exact matches

If we compare it with biological evolution on different Geological Time Scale first developed life was also in the form of fish which originated during Cambrian period.

During Expedition 359, Eberli's team drilled seven holes along the Maldives Archipelago to collect sediments that hold records of past sea level and environmental changes during the Neogene, a geological time period that began 23 million yearDuring Expedition 359, Eberli's team drilled seven holes along the Maldives Archipelago to collect sediments that hold records of past sea level and environmental changes during the Neogene, a geological time period that began 23 million yearduring the Neogene, a geological time period that began 23 million years ago.

Scientists believe that they occurred during a short period of time in geological terms.

However, researchers from the University of Bristol and the Chengdu Center of the China Geological Survey, have found that size played no role in the extinction of fish during the largest mass extinction of all time.

The Silurians supposedly evolved on Earth during the eponymous era, a geological time period lasting from 443 million to 416 million years ago.

In the article he makes rather sweeping negative statements concerning all geological - historical research into the causes of CO2 and climate variations during geological time.

Temperatures over that period varied probably by less than 2 deg C, so the climate during which we developed our way of life was very consistent when compared with the long - term geological time scale.

For example, atmospheric carbon dioxide grew by approximately 30 % during the transition from the most recent cold glacial period, about 20,000 years ago, to the current warm interglacial period; the corresponding rate of decrease in surface ocean pH, driven by geological processes, was approximately 50 times slower than the current rate driven largely by fossil fuel burning.

While the conditions in the geological past are useful indicators in suggesting climate and atmospheric conditions only vary within a a certain range (for example, that life has existed for over 3 billion years indicates that the oxygen level of the atmosphere has stayed between about 20 and 25 % throughout that time), I also think some skeptics are too quick to suggest the lack of correlation between temperature and CO2 during the last 550 million years falsifies the link between CO2 and warming (too many differences in conditions to allow any such a conclusion to be drawn — for example the Ordovician with high CO2 and an ice age didn't have any terrestrial life).

The Silurians supposedly evolved on Earth during the eponymous era, a geological time period lasting from 443 million to 416 million years ago.

This week in the journal Nature, Csatho writes a «News and Views» analysis that comments on the latest research in this area: A new study in Nature by Kristian K. Kjeldsen, Niels J. Korsgaard, Kurt H. Kjær and colleagues, who used aerial photographs, remote - sensing observations and geological evidence to estimate the Greenland Ice Sheet's mass loss during three time periods since the start of the 20th century: 1900 - 83, 1983 to 2003 and 2003 - 10.

Never in recent geological history and during the time in which humans have been on the Earth has the atmospheric CO2 concentration been as high as it is today.

What you see in the geological record is our planet has a constantly varying climate — in recent times during the Pleistocene Era (the last 2.65 million years), we have long ice ages interspersed with relatively short (10 - 20,000 years) interglacial periods.

There is no geological evidence whatsoever that natural sources and sinks have ever been in step at any time during the last 500,000,000 years.

Alps About Blog David Bressan is a geologist and during his research on glaciers he became interested in history and the development of geological concepts in time.