Tag Archives: levels

[ad_1] Ocean acidification could reach unprecedented levels Ocean acidification is expected to reach levels never seen during the last 14 million years, in a "business" scenario as usual "emissions of carbon dioxide …

[ad_1] The Earth 's oxygen levels have increased and decreased more than a hundred million years before the global success of the Grand Oxidation Event there are about 2.4 billion. 39 years, …