lesson
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If your body temperature rises by just 1.5โC, you develop a fever. What happens when our entire planet runs a fever?
Over the past 150 years, Earth's global average surface temperature has climbed by roughly 1.2โC (2.2โF), tracking an unprecedented surge in atmospheric greenhouse gases.
When climatologists graph this warming, why do they display anomalies instead of raw thermometer readings?
Reading Temperature Anomalies
A temperature anomaly is the difference between an observed temperature and a long-term reference average, known as the baseline.
Using anomalies allows scientists to combine data from freezing mountaintops and scorching deserts without local temperature extremes skewing the global average.
๐Create an interactive visual explaining Temperature Anomalies vs Absolute Temperatures. Top panel: A formula banner 'Anomaly = Observed Temp - Baseline Average (1951-1980)'. Below, show a timeline from 1880 to 2024 with a horizontal dashed 0.0ยฐC baseline. Vertical bars show annual values: blue bars extending below the baseline for negative anomalies (-0.4ยฐC in early 1900s), transitioning into dark red bars extending well above the baseline (+1.2ยฐC in 2023). Include clear tooltips or static callouts highlighting a negative anomaly year (e.g., 1910: -0.35ยฐC) and a positive anomaly year (e.g., 2020: +1.02ยฐC). Clean, responsive UI with light background (#f8fafc), dark text (#1e293b), red accent (#ef4444), and blue accent (#3b82f6).
If a weather station averages 14.0โC during a 30-year baseline period and records 15.1โC this year, the anomaly is +1.1โC.
How do we match these warming temperatures against the chemical composition of our atmosphere?
Carbon Dioxide and the Keeling Curve
We measure atmospheric carbon dioxide (CO2โ) in parts per million (ppm), which represents the number of CO2โ molecules present in every one million molecules of dry air.
In 1958, American geochemist Charles David Keeling began continuous measurements atop Hawaii's Mauna Loa volcano, documenting that CO2โ was climbing year after year.
๐Create a dual-axis line graph comparing Atmospheric CO2 (left Y-axis, 280 to 440 ppm, green line) and Global Surface Temperature Anomaly (right Y-axis, -0.6ยฐC to +1.4ยฐC, orange/red line) from 1880 to 2024. The X-axis marks decades (1880, 1900, 1920, 1940, 1960, 1980, 2000, 2020). Highlight historical milestones: 1880 pre-industrial baseline (~285 ppm, -0.2ยฐC), 1958 Keeling measurements start (~315 ppm), and 2024 (~424 ppm, +1.2ยฐC). Include a legend and a toggle or highlight box showing how both lines curve upward exponentially after 1960. Responsive design, light gray container, bold readable axes.