Sentence examples for atmospheric level from inspiring English sources

These data imply that by about 3.4 billion years ago sulfate-reducing bacteria had become active, the oceans were rich in sulfate, and the atmosphere contained appreciable amounts (>10 -13 >10 -13 present atmofpheric level) of free oxygen.

From analyses of early Precambrian paleosols it has been determined that the oxygen content of the atmosphere 2.2 billion years ago was one hundredth of the present atmospheric level (PAL).

"At an atmospheric level it was a forceful presentation.

In a literal way they are right; but on another, atmospheric level, the scent of Tony still pervades British politics.

By the time of the widespread appearance of eukaryotes at 1.8 billion years ago, oxygen concentration had risen to 10percentt of present atmospheric level (PAL).

Increasing atmospheric level of greenhouse gases are causing global warming and putting at risk the global climate system.

And atmospheric levels are rapidly rising.

And how much will atmospheric levels of the gases rise over coming decades?

Higher temperatures imply higher concentrations of atmospheric water vapour, while lower temperatures suggest lower atmospheric levels.

If they cannot agree on a common strategy, atmospheric levels of carbon dioxide are likely to reach potentially disastrous levels.

Without the decisions taken 20 years ago, atmospheric levels of ozone-depleting substances would have increased tenfold by 2050.