Sentence examples for present day levels of from inspiring English sources

Carbon dioxide (CO2) concentrations have increased from roughly 280 ppmv in pre-industrial times to present day levels of ~380 ppmv, mostly due to fossil fuel burning and deforestation [ 1].

Thus, the formation of this syntenic region seems to have coincided with a period of Earth history characterized by a rise in atmospheric oxygen from 0.02-0.04 atm 850 MYA to present day levels of 0.2 atm 540 MYA [ 55].

Royer, D. L. et al. Paleobotanical evidence for near present-day levels of atmospheric CO2 during part of the Tertiary.

In 2002, geochemist Robert Berner of Yale University calculated that during the past 600 million years, atmospheric concentrations of oxygen were stable near present-day levels of 20% until about 400 million years ago, rose sharply to a peak above 30% about 300 million years ago, and then dove to 12% by 240 million years ago.

In a population of adults, present-day levels of PM10 and nitrogen dioxide were associated with an increase in blood pressure (Choi et al. 2007).

Although the clinical relevance of these responses remains unknown, the findings support in general the notion that present-day levels of PM2.5 could potentially rapidly affect CV physiology in a manner contributing to the instigation of acute CV events in susceptible people.

Considering that metallicolous populations are presumed to evolve from non-metallicolous populations, this evidence may imply that selection for Cu tolerance in C. communis has been greater than in R. acetosa, although present-day levels of Cu tolerance in metallicolous populations are lower in R. acetosa.

Due to climate change alone, the models predicted a loss of between 400 and 2600 petacalories of food supply, 8 to 43percentt of present day levels.

Before about 800 million years ago, it was as low as 0.1% of present day levels.

As an implication to Mars and in the range of our model, the study concludes that an ancient core field modified by a CMB heat flux anomaly is not able to heterogeneously magnetise the crust to the present-day level of north south asymmetry on Mars.

The 21 sites per 3.6 Mb genome are significantly large number for present-day level of genome analysis.