Sentences with phrase «ancient atmospheric concentrations»
Scientists can determine ancient atmospheric concentrations by measuring CO2 and methane levels in tiny air bubbles trapped in such ice, formed when the ice fell to the earth as snow.
https://www.scientificamerican.com/ Not exact matches
Since the industrial revolution, human beings burning fossil fuels have boosted concentrations of atmospheric carbon more than 30 percent, disrupting the ancient cycle.
While previous studies point to atmospheric CO2 concentrations of 3,000 — 4,000 parts per million during ancient greenhouse events, Breecker's team revises this down to around 1,000 parts per million.