OCR GCSE Chemistry B · J258
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Evidence for climate changeFossil fuels contain ancient carbon with an isotopic pattern different from carbon in recently living systems. Measurements of the modern atmosphere show the expected fingerprint of added old, fossil carbon. This identifies the type of source more specifically than a simple time correlation can.