Major emitters knew of fossil fuel dangers decades earlier than claimed, CIEL report finds

A new report from the Center for International Environmental Law (CIEL) argues that governments in major emitting countries like the US, UK, Germany, and Canada had credible scientific warnings about climate risks from fossil fuels as early as the 1960s, and in some cases earlier. The report challenges claims made before the International Court of Justice that meaningful awareness only emerged in the late 1980s. The report cites evidence including a 1965 US Science Advisory Committee warning on sea-level rise, 1950s US Air Force research on CO2, and German government scientist Hermann Flohn's 1941 paper on climate change. CIEL says this early knowledge has legal implications for state responsibility under international law, especially after the ICJ's 2025 advisory opinion on climate obligations. For carbon market participants, the timeline of knowledge matters for liability discussions and the framing of historical responsibility in climate finance negotiations. The report is a direct challenge to the narrative that delayed action was based on ignorance rather than choice.