Soon though, it began to use up all of its nutrients and they weren't being replenished quickly enough. It also came to pass that the waste products were poisonous and although at first it appeared there was plenty of space for it, now it was everywhere. Soon it became impossible to live without getting coated in filth and the food was harder to find. The vital ingredients for survival were depleted and the environment became so toxic that one day it reached a tipping point. The majority of all life on the planet died. It wasn't gradual, more like an apocalyptic tragedy. Over the course of a handful of years, the fertile and abundant planet Earth became a toxic mire. Their bi-products formed a layer of chemical deposits all around the globe, an eternal reminder of what had occurred.
You may be wondering what this life form is, what creature was responsible for this disaster? The answer is cyanobacteria, or 'blue-green algae' as it is sometimes known. This microbial cell was one of the first organisms to break free from the primordial soup that festered for millennia within the thick oceanic waters. You can still find them today, living in some of the most inhospitable places known to us. Their world was a toxic one, by our standards. The origins of our environment are harsh and hazardous to most of modern life. Thanks to these small and simple creatures, we have an oxygen rich atmosphere to breath and a layer of haematite in the ground to enjoy. That's the bi-product.
Rowan Blair Colver