Seashells point to much warmer past: scientists
2. Why didn't positive feedbacks from this warming result in an uninhabitable planet?
About 3.5 million years ago, Ellesmere Island 11 to 16 C warmer than now1. Wait a minute here: Why didn't the oceans become so acidic that no seashells could form?
...
The study reveals what may happen when levels of the greenhouse gas carbon dioxide stabilize at about 400 parts per million — as was the case when those shells were formed and plants thrived 3.5 million years ago in a much warmer, ice-free Strathcona Fiord.
2. Why didn't positive feedbacks from this warming result in an uninhabitable planet?
Posts
No comments:
Post a Comment