NASA and NOAA point to multiple lines of evidence supporting human-caused climate change. NASA highlights the strong correlation between rising greenhouse gas concentrations since the mid-20th century and global temperature increases, confirmed by satellite measurements and surface observations. NOAA references the Intergovernmental Panel on Climate Change (IPCC) synthesis, which finds that human activities, especially burning fossil fuels, are responsible for approximately 1.07°C of warming, while natural factors contributed little.
Both agencies emphasize peer-reviewed attribution studies. For example, the IPCC AR6 report, summarized by NOAA, attributes almost all observed warming since 1950 to human activities rather than natural drivers like solar variability or volcanic eruptions. These conclusions are bolstered by physical data such as atmospheric CO2 increases measured at Mauna Loa Observatory and global climate model simulations that cannot replicate recent warming without including human emissions.
Together, NASA and NOAA provide a robust scientific consensus, grounded in decades of empirical evidence and analysis, that human activities are the dominant force behind current global climate change.