World Scientists' Warning to Humanity

The document warns that human beings and the natural world are on a 'collision course' due to the degradation of the atmosphere, water, oceans, soil, and forests. It argues that the earth's finite capacity to provide food and energy is being overwhelmed by unrestrained population growth and overconsumption by developed nations. To avert catastrophe, the authors advocate for a transition from fossil fuels to inexhaustible energy sources, the stabilization of the human population through voluntary family planning, the elimination of poverty, and the diversion of war funding—estimated at over $1 trillion annually—toward environmental stewardship.

• The earth's critical environmental systems are under severe stress, including stratospheric ozone depletion, the collapse of some fisheries, and the degradation of 11 percent of the earth's vegetated surface since 1945, an area exceeding the combined size of India and China.
• Human-induced emissions of carbon dioxide from deforestation and fossil fuel burning may cause global climate alteration, and the cumulative damage to the web of life could trigger unpredictable collapses of critical biological systems.
• Unrestrained population growth threatens to overwhelm sustainability efforts; the document notes World Bank and United Nations estimates that the global population could stabilize between 12.4 billion and 14 billion, nearly tripling the 1992 population of 5.4 billion.
• To prevent global collapse, the authors propose five simultaneous actions: controlling environmentally damaging activities (including moving away from fossil fuels), managing crucial resources more effectively, stabilizing population via voluntary family planning, eliminating poverty, and ensuring sexual equality and reproductive control for women.
• Developed nations, identified as the world's largest polluters, must reduce overconsumption and provide financial and technical aid to developing nations, while global resources currently spent on war—over $1 trillion annually—should be diverted to these environmental challenges.

APA

Kendall, H. (1992). World Scientists' Warning to Humanity. Union of Concerned Scientists. https://www.ucs.org/resources/1992-world-scientists-warning-humanity

Chicago

Kendall, Henry. World Scientists' Warning to Humanity. Union of Concerned Scientists, 1992. https://www.ucs.org/resources/1992-world-scientists-warning-humanity.

Wikipedia

{{cite press release |last1=Kendall |first1=Henry |title=World Scientists' Warning to Humanity |publisher=Union of Concerned Scientists |date=16 July 1992 |url=https://www.ucs.org/resources/1992-world-scientists-warning-humanity |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@misc{kendall1992world, author = {Kendall, Henry}, title = {{World Scientists' Warning to Humanity}}, publisher = {Union of Concerned Scientists}, year = {1992}, month = jul, url = {https://www.ucs.org/resources/1992-world-scientists-warning-humanity}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }