One such type is called ‘Reverse 911’, which uses automatic telephone calls to alert people within a certain geographical area about potential dangers or instructions they need to follow during a crisis situation. Whilst this system is relatively cost effective & efficient at providing information quickly , it has its limitations as not everyone may have access landlines/mobile phones thus hindering dissemination vital messages time. Another system involves using broadcast radio & television networks inform public regarding dangers approaching them well any necessary actions should taken minimise damage . Whilst this offers much wider reach compared other methods due sheer size coverage traditional media outlets possess , there remains issue not all individuals may listening watching television/radio particular moment meaning some crucial details get missed out . A third alternative will involve setting up siren systems specific locations alerting local populace something wrong either recorded audio clips playing loudspeakers live broadcasts letting them know what needs done stay safe ultimately ensure their own survival times extreme danger. Ultimately it important remember no single method mentioned above completely foolproof so combination multiple strategies always be utilised order guarantee maximum effectiveness best chance succeeding keeping populace informed safe during difficult situations

Sample Solution

The 2011 Fukushima nuclear disaster in Japan is an example of a disaster that had serious consequences for the local population, and therefore could have benefited from the use of warning systems to notify the public and provide instructions. To this end, there exist multiple types of warning systems which can be used in disasters.