Understand the science of Earth’s climate the way it is actually established — the mechanisms and the data, not the politics. Learn how the greenhouse effect works (why gases like carbon dioxide, methane, and water vapor trap outgoing heat and warm the planet), the difference between the natural greenhouse effect and the human-enhanced one, and the carbon cycle of sources and sinks. See the lines of evidence for observed warming — the instrumental record, rising CO2, ice cores, and ocean heat — and the physical consequences the science describes: sea-level rise, ocean acidification, and more intense heat and heavy rainfall. Just as important, build the data-reading skills that cut through confusion: weather vs climate, a temperature anomaly vs an absolute reading, a long-term trend vs year-to-year variability — plus the common misconceptions (a cold snap does not disprove warming; “the climate has always changed” is about rate and cause). Grounded in the IPCC AR6 Summary for Policymakers and NASA/NOAA primers. Strictly non-partisan and educational — the science of how the climate system works and what the data show, not policy advocacy or personal advice.