Underlying the report is a broad scientific consensus: The farther and the faster the Earth system is pushed toward further change, the greater the risk is of unanticipated effects, some of which are potentially large and irreversible.įor example, without major reductions in emissions, the increase in annual average global temperature relative to preindustrial times could reach 9☏ (5☌) or more by the end of this century. Credit: Jesse Allen, NASA Earth Observatory/VIIRS/Suomi-NPP The report meticulously outlines how these effects can be largely traced back to human activities and associated emissions of radiatively important gases and particles. Thousands of studies outlined in the report document rising surface, atmospheric, and oceanic temperatures melting glaciers diminishing snow cover shrinking sea ice rising sea levels ocean acidification and increasing intensity and frequency of rainfall, hurricanes, heat waves, wildfires, and drought. “For the warming over the last century, there is no convincing alternative explanation supported by the extent of the observational evidence.”Īnd the observational evidence is manifold. “It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century,” the report concludes. “It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century.” government organization that coordinates and integrates federal research on changes in the global environment and their implications for society, also lays out the current state of science relating to climate change and its physical effects. The Climate Science Special Report (CSSR), created by a U.S. Today scientists released a new report that details how climate change is affecting weather and climate across the United States and how future changes in climate could play out across the country.
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