PLEA Network

28 November 2015, Climate News Network, Records reveal warming’s first warning. COP 21: Scientists identify a worldwide pattern of climate change in the late 1980s as the early signpost that has now led to the crucial UN summit in Paris. Climate change may have begun more than 25 years ago. At around the time that global warming and the spectre of climate change first emerged as a geopolitical challenge for future generations, it had already commenced, according to new research. As world leaders gather in Paris for COP21, the UN summit seeking to get a global agreement on responses to climate change, British oceanographers and colleagues from around the world have identified a “major change in the Earth’s biophysical systems” in the late 1980s. They looked back into recent climate history, and now say that the change can be attributed to “rapid global warming from anthropogenic plus natural forcing”. Climate scientists have been warning for decades that the build-up of greenhouse gases in the atmosphere, as a result of the human combustion of fossil fuels, will at some point tip stable climate zones into new regimes – a shift defined by the researchers as an “abrupt, substantial and persistent” change. Most climate scientists expect such change to happen in the next few decades, but this new study seems to declare that it has already started to happen. Cause and effect The scientists report in Global Change Biology journal that they have identified a worldwide pattern of change, centred around 1987, that was seemingly associated with the eruption of Mexico’s El Chichón volcano in 1982. Analyses such as these are complex. No single weather event can be taken as significant, while cause and effect also are not easily linked. Read More here