Most people think of early warning in terms of immediate and short-term concerns such as major weather events (hurricanes, cyclones, tornadoes), climatic variations (El Niño events, or droughts caused by lack of rainfall), or geo-physical events like earthquakes and tidal waves. These immediate and often unpredictable events require specific measuring and advisory systems. Specifically targeted national and international organizations focus on the early warning of these events.
UNEP supports these activities and is directly involved in partnerships designed to ensure the more timely delivery of data and information on such natural hazards. However, UNEP primarily focuses on identifying issues which take much longer to develop and might better be identified as "emerging environmental threats."