Throughout our planet's history, Earth has fluctuated between a hothouse and an icehouse.
Today, our home is supposed to be in a period of global cooling, but human emissions of greenhouse gasses are reversing that natural trend at a rapid and unprecedented rate.One of the last times Earth went from an icehouse to a hothouse this quickly and dramatically, about 304 million years ago, our planet experienced major upheaval.
The findings are based on a fresh analysis of trace elements in a slab of ancient black shale in South China. The isotopes of carbon and uranium within this rock suggest that on top of global warming, rising sea levels, and melting glaciers, we also need to worry about ocean anoxia.because when ice caps melt and add fresh water to the ocean surface, it obstructs atmospheric oxygen from dissolving and circulating in the sea.
Perhaps the reason has to do with the fact that greenhouse gasses in a hothouse world are already high, so emissions don't have as strong a melting effect on ice sheets and permafrost. Researchers suspect the massive release of carbon that caused climate change between 290 and 340 million years ago was probably stimulated by volcanic eruptions.
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