Climate Change

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While natural forces have influenced the earth’s climate, human-induced increases in atmospheric greenhouse gases from fossil fuels and land-use changes are now driving most of the observed warming. Temperature increases have already affected natural and human systems in many regions, and global temperatures will continue to rise for decades to come.

For the benefit of humanity, the American Geophysical Union and its network of Earth and space scientists are committed to studying climate change, its impacts and opportunities for adaptation, and to educating the public on what they learn.


  • Nearly 7 million U.S. children are currently affected by asthma. The changing climate contributes to increased levels of airborne allergens that are associated with a risk of increased allergic and asthmatic episodes
  • Since 1980, wildfire season in the Western U.S. has lengthened by 78 days.
  • From 2004 to 2013, the United States saw estimated multibillion dollar losses from the following disasters: $392 billion from hurricanes, $78 billion from heat waves and drought, and $76 billion combined from tornadoes, flooding, and severe storms.
  • According to the Department of Defense, “the military could be called upon more often to support civil authorities, and provide humanitarian assistance and disaster relief in the face of more frequent and more intense natural disasters.