Geoscience Reference
In-Depth Information
up sunlight, made food, and belched out oxygen as a waste product of their endeavours. That sudden
pulse of oxygen may have been exactly what complex life was waiting for.
Biologists are now trying to figure out how to test these ideas. But there's something they all agree
on. Whatever creative role the Snowball may have played in shaping a new world order, it would also
have been devastating for many of the life-forms it first encountered. And this raises a disturbing ques-
tion: could another Snowball happen today? If the ice returned to haunt us, the consequences would
be horrific. Earth has come a long way since the simple days of Slimeworld, and life is now a complex
web of interdependent creatures. If another Snowball engulfed the Earth, many—perhaps most—of
these creatures would perish.
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