Quote:
Originally Posted by Vulcan
Here's an interesting tool where you can see what earth looked like 250 million years ago? Or 1 billion years ago? Or 4.5 billion years ago?
EarthViewer is an interactive tool that allows you to explore the science of Earth's deep history.
Interestingly Calgary is one of the cities used as a frame of reference. If you check out the ice age you can see the narrow open area running down from the north to the open area of the rest of NA where the Calgary area running along the Rocky Mountains is ice free.
http://www.hhmi.org/biointeractive/e...adbb7-69199437 |
So sliding back the scales, at some points, C02 is about 10 times what it is today yet the planet is covered in ice. What's the explanation for that?