An Ominous Milestone

We have recently passed a foreboding, ominous milestone:

Our atmosphere has reached the highest level of carbon in 5 million years.

Image

(picture and more info at the Independent)

Researchers have recorded CO2 levels of over 400 parts per million, a level not seen on Earth for 5 million years.

We all know that rising atmospheric carbon levels are leading climate change, which could cause all manor of global catastrophes, but what exactly does this benchmark mean?

It means that we have returned to a carbon level not seen on this planet since a time long before we existed as a species, when there was no ice on the Arctic Ocean, and there were jungles across Canada.

Scary thought, huh?

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