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In what year was the "hockey stick graph" produced?

  • 1999

  • 2001

  • 2003

  • 2005

Answer

The "hockey stick graph," published in 1999, visually depicted the divergence between increasing global temperatures over the last 1000 years and the relatively stable temperatures over the preceding millennium. It provided compelling evidence of the significant human impact on recent climate change, as the sharp rise in temperatures coincided with the increase in greenhouse gas emissions.
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