On 25th Anniversary of ‘Letter to Humanity’ 15,000 Scientists Update Warning to the World on Climate

Since the first warning in 1992, things have only gotten worse.

25 years ago, the Union of Concerned Scientists sent a Letter to Humanity, backed by 1,700 signatures, warning of the dangers human behavior presents to our climate and ecosystem on Earth. Now 15,000 scientists say it’s much worse.

Environmental experts from around the world signed the updated “warning to humanity” about the dangers to all of us. These scientists say the picture looks far more bleak than it was in 1992. Humanity exacerbated almost all of the problems identified in the original warning.

Mankind still faces runaway consumption of limited resources by a rapidly growing population. And “scientists, media influencers and lay citizens” fail to do enough to fight against it.

They pointed out that in the past 25 years:

  • The amount of fresh water available per person worldwide reduced by 26%.
  • The number of ocean “dead zones” – barren areas due to pollution and oxygen starvation – increased by 75%.
  • Nearly 300 million acres of forest disappeared, mostly to make way for agricultural land.
  • Global carbon emissions and average temperatures continued significant increases.
  • Human population rose by 35%.
  • Collectively the number of mammals, reptiles, amphibians, birds and fish in the world fell by 29%.

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