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| Lack of oxygen delayed the rise of animals on Earth Posted: 31 Oct 2014 09:12 AM PDT Scientists have long speculated as to why animal species didn't flourish sooner, once sufficient oxygen covered the Earth's surface. Animals began to prosper at the end of the Proterozoic period -- but what about the billion-year stretch before that, when most researchers think there also was plenty of oxygen? Yale University researcher Noah Planavsky and his colleagues found that oxygen levels during the 'boring billion' period were only 0.1 percent of what they are today.       |
| Three abrupt pulses of carbon dioxide during last deglaciation, study shows Posted: 29 Oct 2014 11:56 AM PDT The rise of atmospheric carbon dioxide that contributed to the end of the last ice age more than 10,000 years ago did not occur gradually, but was characterized by three 'pulses' in which carbon dioxide rose abruptly.  |
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