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The atmosphere and ocean have warmed, the amounts of snow and ice have diminished, and sea level has risen.” 13 “Warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia. It is likely that most of the warming in recent decades can be attributed to human activities (IPCC 2001)." (2005, 11 international science academies) 10 The evidence comes from direct measurements of rising surface air temperatures and subsurface ocean temperatures and from phenomena such as increases in average global sea levels, retreating glaciers, and changes to many physical and biological systems. However there is now strong evidence that significant global warming is occurring. There will always be uncertainty in understanding a system as complex as the world’s climate. Human activities (mainly greenhouse-gas emissions) are the dominant cause of the rapid warming since the middle 1900s (IPCC, 2013)." (2015) 9 Global Change Research Program (Melillo et al., 2014) that global climate has warmed in response to increasing concentrations of carbon dioxide (CO2) and other greenhouse gases. "The Geological Society of America (GSA) concurs with assessments by the National Academies of Science (2005), the National Research Council (2011), the Intergovernmental Panel on Climate Change (IPCC, 2013) and the U.S. "Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research demonstrates that the greenhouse gases emitted by human activities are the primary driver." (2009) 2 Statement on Climate Change from 18 Scientific Associations

The following is a partial list of these organizations, along with links to their published statements and a selection of related resources. In addition, most of the leading scientific organizations worldwide have issued public statements endorsing this position. Multiple studies published in peer-reviewed scientific journals 1 show that 97 percent or more of actively publishing climate scientists agree *: Climate-warming trends over the past century are extremely likely due to human activities. Multiple studies published in peer-reviewed scientific journals show that human activities are the primary cause of the observed climate-warming trend over the past century.

A consensus on climate change and its human cause exists.