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They evidently sold well , because on November 15 Burns was able to send Mrs. Frances Dunlop only five of the six copies she had requested . Women and children are particularly vulnerable . Human vulnerability to environmental change is complex ; it may , in fact , be as complex as ecological processes , where some cause and effect linkages are still not fully understood despite centuries of scientific research . An equally pressing issue , addressed in Chapter 3 , concerns the fact that vast proportions of the population in various African countries are vulnerable to disasters resulting from the use of the environment and from social tensions which often develop when multitudes of people live together . Concerns for energy security , rising energy demand and costs , human health and the environment – particularly climate change – have all created a new impetus for change in the energy sector .