Scientists have warned that huge numbers of species could be wiped out, but there isn’t a single, universally accepted quote like “the entire species will be wiped out” that clearly belongs to one famous scientist and is both accurate and well‑documented. In most cases, viral lines that sound that absolute are oversimplified or distorted versions of more careful scientific statements about mass extinction risk.
Who actually said what?
One of the clearest modern statements comes from Mike Coffin, a marine geophysicist at the University of Tasmania. He argued that human activity is driving what could become Earth’s sixth mass extinction and estimated that humans could wipe out about 75% of species between roughly 240 and 500 years from now if current trends continue. That’s a stark warning, but it’s not a prediction that literally every species will disappear; it’s an estimate for crossing the 75% threshold scientists use to define a mass extinction event.
Other biologists and conservation researchers have published work showing that species are disappearing far faster than the background rate seen in the fossil record, again suggesting we are at the start of a human‑driven mass extinction. Here too, the language is dire, but the focus is on very high percentages of loss, not total biological annihilation.
Misquotes and exaggerated claims
Some of the quotes that circulate online about “humanity being wiped out” or “all species going extinct by a certain year” trace back to misreported lectures and sensational headlines, not to what the scientists themselves actually said. For example, a 2018 climate lecture by Harvard atmospheric chemist James Anderson was turned into an article and then social media posts claiming he warned humans would go extinct by 2023. Anderson later clarified that this “wiping out of humanity” claim was a complete fabrication of his words and that he would never make such a statement.
Climate activist Greta Thunberg amplified one of those misinterpretations in a now‑deleted tweet that said a top climate scientist warned that climate change would wipe out humanity unless we stopped using fossil fuels over the next five years. Fact‑checkers have since shown that this tweet was based on a misreading of Anderson’s talk and did not correctly reflect his position.
Earlier decades also saw dramatic predictions from some experts and commentators about huge proportions of species disappearing by specific dates, many of which have not unfolded as stated and are now cited as cautionary tales about overconfident forecasting. These examples highlight how easily nuanced scientific concerns about extinction can turn into absolute “everything will be wiped out” soundbites once they pass through headlines and social media.
What science really says about extinction risk
Modern conservation biology does support a serious warning: we are likely in the early stages of a human‑driven mass extinction, and large fractions of Earth’s species could be lost within a few centuries if habitat destruction, pollution and climate change continue unchecked. That means the risk is very high for countless animals, plants and ecosystems, but it does not mean scientists have proven or agreed that every single species, or humanity itself, will inevitably be wiped out.
When you see a quote claiming that “a scientist said the entire species will be wiped out,” it’s almost always either referring loosely to these mass‑extinction warnings or repeating a misquote rather than a precise, documented statement. The responsible takeaway from current research is that the scale of potential loss is enormous and deeply worrying, but still surrounded by uncertainty and strongly dependent on what societies do in the coming decades.