Why Scientists Disagree About Global Warming is a 2015 report produced by the Nongovernmental International Panel on Climate Change (NIPCC), a project of the Heartland Institute, a conservative think tank known for climate change skepticism. Authored by Craig D. Idso, Robert M. Carter, and S. Fred Singer, the report argues against the scientific consensus on anthropogenic global warming by highlighting disagreements among scientists, uncertainties in climate models, and natural factors influencing climate. It critiques surveys claiming a consensus on global warming, rebuts IPCC findings, and summarizes evidence from peer-reviewed studies suggesting natural variability dominates climate change. The publication is part of the broader Climate Change Reconsidered series and has been criticized for cherry-picking data and promoting views aligned with fossil fuel interests, with some reviewers accusing it of misinformation for financial gain. The report identifies four main reasons for scientific disagreement: interdisciplinary conflicts, uncertainties in climate sensitivity, unreliable climate models, and economic or political biases influencing research. It draws on previous NIPCC work to survey physical science evidence, emphasizing that global warming has paused or flattened contrary to model predictions. Published by the Heartland Institute, it serves as a counter-narrative to mainstream climate science, often distributed to policymakers and educators to sow doubt about human-caused climate change. Despite its claims, the report has faced significant backlash from the scientific community for lacking peer review and relying on selective evidence.