Enhanced Greenhouse Effect
Additional warming caused by anthropogenic greenhouse gas increases above natural atmospheric concentrations.
Formula
CO₂ concentration: pre-industrial ~280 ppm → current ~420 ppm (50% increase)
Real World
The Mauna Loa Observatory in Hawaii has recorded atmospheric CO₂ continuously since 1958, producing the famous Keeling Curve showing CO₂ rising from 315 ppm to over 420 ppm — the clearest evidence of human-driven greenhouse gas accumulation.
Exam Focus
Quote specific data (e.g. 1.1°C warming, 50% CO₂ increase) and name sources like IPCC to demonstrate evidence-based answers.
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