Numerous themes have been tackled in this way, including vulnerability to addiction, social cover for underprivileged groups, the propagation of epidemics, the precarious balance between the increasing wealth and the aging population in Vietnam, the melting of the Antarctic sheet ice, the bleaching of coral reefs due to ocean warming, the double jeopardy suffered by natural disaster victims who are unable to rebuild their homes due to a sudden infl ation in property prices, the phytoremediation (the use of plants to remediate polluted water), the perception of fl oods as a blessing that triggers state aid in Melanesia or reward strategies for traders and their role in triggering the fi nancial crisis.