Most people feel a strong dislike for waste - images which depict waste on a massive scale are therefore likely to be more effective than individualising wasteful behaviour, and may help to connect individual actions to wider consequences. Coupling images like this with constructive solutions-focused imagery is one way to ensure that viewers' attention and emotions are directed in a proactive way.
WHAT IT SHOWS: GHANA. Accra, 2016. Agbogbloshie dump.