Earth’s sixth mass extinction has begun, new study confirms
We are currently witnessing the start of a mass extinction event the likes of which have not been seen on Earth for at least 65 million years. This is the alarming finding of a new study published in the journal Science Advances.
The research was designed to determine how human actions over the past 500 years have affected the extinction rates of vertebrates: mammals, fish, birds, reptiles and amphibians. It found a clear signal of elevated species loss which has markedly accelerated over the past couple of hundred years, such that life on Earth is embarking on its sixth greatest extinction event in its 3.5 billion year history.
This latest research was conducted by an international team lead by Gerardo Ceballos of the National Autonomous University of Mexico. Measuring extinction rates is notoriously hard. Recently I reported on some of the fiendishly clever ways such rates have been estimated. These studies are producing profoundly worrying results.
However, there is always the risk that such work overestimates modern extinction rates because they need to make a number of assumptions given the very limited data available. Ceballos and his team wanted to put a floor on these numbers, to establish extinction rates for species that were very conservative, with the understanding that whatever the rate of species lost has actually been, it could not be any lower.
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Whistler Blowers, Insiders
The abstract clearly states it’s based on previous ESTIMATES and what if scenarios.