If the public and policymakers want a single adjective to describe the findings of the Intergovernmental Panel on Climate Change’s new assessment report that’s the word.

Released Friday, the IPCC report states, that “warming in the climate system is unequivocal and since 1950 many changes have been observed throughout the climate system that are unprecedented over decades to millennia.”

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“Our assessment of the science finds that the atmosphere and ocean have warmed, the amount of snow and ice has diminished, the global mean sea level has risen and the concentrations of greenhouse gases have increased,” said Qin Dahe, Co-Chair of IPCC Working Group I, responsible for this first stage of the IPCC’s reporting on climate. Whereas this report focuseson the geoscience of climate change, subsequent working groups, whose work will be published in 2014, will focus on other aspects of the science as well as mitigation.

Read the full report .
Headline statements from the IPCC (pdf).

The report reaffirms that the human influence on the planet’s dramatic warming is clear and beyond reproach. According to a press statement accompanying the release of the report:

Thomas Stocker, Co-Chair of the working group behind the report indicated that in order to prevent the worst case scenarios presented in the report for the century ahead, governments will need to take aggressive action. “Continued emissions of greenhouse gases will cause further warming and changes in all components of the climate system,” Stocker said. “Limiting climate change will require of greenhouse gas emissions.”