In 1992, the Union of Concerned Scientists and the majority of Nobel laureates in the sciences penned the “World Scientists’ Warning to Humanity.” Pointing to growing problems like ocean dead zones, biodiversity destruction, climate change, and continued human population growth, the scientists argued that “a great change in our stewardship of the Earth and the life on it is required, if vast human misery is to be avoided.”
Now, 25 years after this initial dire warning, over 15,000 scientists from 184 countries have signed a much more urgent letter to humanity.
Led by William Ripple, an ecologist at Oregon State University, the “second notice” to humanity warns that we are on a collision course with the natural world, and that “soon it will be too late to shift course away from our failing trajectory.”
“Since 1992, with the exception of stabilizing the stratospheric ozone layer, humanity has failed to make sufficient progress in generally solving these foreseen environmental challenges, and alarmingly, most of them are getting far worse,” the scientists write.
In particular, the authors fear that rising greenhouse gas emissions from fossil fuel use, deforestation, and agricultural production significantly raise the risk of catastrophic climate change. As the growing population continues to stress ecosystems, more communities will face water shortages, failed harvests, and growing unrest.
The authors write: “By failing to adequately limit population growth, reassess the role of an economy rooted in growth, reduce greenhouse gases, incentivize renewable energy, protect habitat, restore ecosystems, curb pollution, halt defaunation, and constrain invasive alien species, humanity is not taking the urgent steps needed to safeguard our imperiled biosphere.”
Globally, freshwater resources continue to be depleted, ocean dead zones continue to expand, and the amount of species and forestry continue to plummet at unprecedented rates. Our growing population, land use, and fossil fuel use are threatening the very foundations for life on Earth.