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Hard was the heart , stony and seared the eye , that had no tear for that moment . Some equally important impacts , such as personal pain and suffering , and loss of uncompensated labour ( such as child care ) are not adequately captured . Desertification is another serious concern in Africa , particularly in the more arid zones where climate variability and poor land management practices combine to threaten the sustained productivity of soil and vegetation . Investments in highly efficient , service-oriented and clean public transport followed by incentives for its use are another effective measure in controlling urban pollution . Each year we include a range of available indicators , particularly including any that have been updated or which shed new light on key trends . Ironically a possible factor in the failure of the expedition was the indiscretion of Giuseppe Mazzini , compiler of this account , who , believing that there was no postal censorship in Britain , mailed details of the plot to another Italian revolutionary in London . No such studies have been carried out at the national level in developing countries , but some studies have been carried out in specific cities . The reverse is true for those lacking such endowments . In those swift-flowing muddy waters below her were many people who were not so lucky . World Environment Day , commemorated each year on 5 June , is about you and me . Pope Pius IX and Charles Albert of Savoy , whose son Victor Emmanuel II was to be king of a united Italy , are among those discomfited by the bell 's sound . The person whose fortune was to be told picked a number and the corresponding answer was read aloud ; some answers were serious , some meant to be humorous . They may operate with different magnitudes and directions than those of the initial stage , and they may emerge or disappear as circumstances dictate . It has a positive fertilizing effect on some crops , known as C3 crops . There are now over 117 000 protected areas worldwide , taking into account both those classified under any of the six IUCN management categories I to VI ( see below ) , and those not classified . There is no uniform solution to the problem of poverty . It is important to note that people in all regions in the world are vulnerable in one way or another to environmental change , but that their coping capacity is different . The table also indicates : the number of countries in each sub-region at each level of evaluation ; the number of people , on average , who live on US $ 1 a day ; and the number of people living below the national poverty line . Poorer countries have fewer cars , but more two - and threewheeled vehicles with dirtier two-stroke engines , and older fleets of vehicles with inefficient or badly maintained engines , and no or poorly functioning emission control devices . Such alerts are given out in several parts of the US , Europe and also in some cities in Mexico . 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 . The demographic dimensions consist of the total population and the urban population figures for Africa , and for each of its sub-regions .