The Union of Concerned Scientists (UCS) is a nonprofit organization based in the United States that focuses on using scientific research to address global challenges. Founded in 1969, UCS aims to promote evidence-based policies in areas such as climate change, energy, and nuclear security. The organization brings together scientists, engineers, and advocates to work on solutions that benefit both people and the planet. UCS conducts research, publishes reports, and engages in advocacy to influence public policy and raise awareness about critical issues. By collaborating with various stakeholders, including policymakers and the public, the organization strives to ensure that scientific knowledge informs decision-making processes related to environmental and social concerns.