Climate Change


This graph, based on the comparison of atmospheric samples contained in ancient ice cores and more recent direct measurements, provides evidence that atmospheric CO2 has increased dramatically since the Industrial Revolution compared to paleoclimatologic (past climate) measurements over the past 800,000 years. (Credit: Luthi, D., et al.. 2008; Etheridge, D.M., et al. 2010; Vostok ice core data/J.R. Petit et al.; NOAA Mauna Loa CO2 record.)


Scientific Consensus:

Earth's Climate Is Warming

Multiple studies published in peer-reviewed scientific journals1 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. In addition, most of the leading scientific organizations worldwide have issued public statements endorsing this position. The following is a partial list of these organizations, along with links to their published statements and a selection of related resources.

Temperature data showing rapid warming in the past few decades, the latest data going up to 2021. According to NASA, 2016 and 2020 are tied for the warmest year since 1880, continuing a long-term trend of rising global temperatures. The eight most recent years have been the warmest. Credit: NASA's Goddard Institute for Space Studies




  • Climate Change Response Framework

  • The potential impacts of climate change and variability on forests and forestry in the Mid-Atlantic Region (US Forest Service, Vol. 14, 2000)

  • Maryland Department of the Environment Climate Change Program



  • One Hundred Thousand Beating Hearts

  • Understanding Climate Change by Joyce Tuten