1979 CE • Geneva, Switzerland
"During the 1960s and 1970s, a series of highly publicized climatic and environmental events, with disastrous consequences, demonstrated the fragility of world food production and trade systems and their dependence on the Earth's climate system. In 1979, in response to these events, WMO, UNEP, FAO, UNESCO and WHO convened the First World Climate Conference (FWCC). The purpose of the conference was to assess the state of knowledge of climate and to consider the effects of climate variability and change on human society."
World Meteorological Organization; http://www.wmo.int/pages/themes/climate/international\_wcc.php