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She observes that this is " an extraordinary result for any private collection . In a national-level study , the US Environment Protection Agency ( US EPA ) , for example , projected the benefits of the Clean Air Act from 1990 to 2010 to be around US $ 690 billion . 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 . The results indicated that indoor air pollution from solid fuel use is the tenth major health risk in the world in terms of potentially preventable lost life-years ( Figure 2 ) , and may be responsible for 0.8 – 2.4 million premature deaths each year worldwide ( Smith and others 2004 ) . 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 . The current state of the African environment , and the vulnerability of large populations in the region to environmental and human-induced disasters , pose an additional challenge to studies of the environment . Some key issues to consider in the formulation of scenarios include : the boundary ; the current state ; the definition and determination of driving forces ; the narrative , or storyline ; and images of the future . Another study in Santiago , Chile , assessed the benefits of compliance with standards set in the Santiago Decontamination Plan at US $ 4 billion over a period of 15 years ( DICTUC 2000 ) . 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 . This volume , an epistolary work which , like Cooper 's , includes observations on travels in the Alps and in Italy , was published as " by the author of ' Hope Leslie , ' ' The Poor Rich Man and the Rich Poor Man , ' ' Live and Let Live , ' etc. " Perhaps Angelica 's taste in fiction , or reading tastes generally , grew more moralistic in mid-century . 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 . " We will not solve this problem if we do not each take our share of the responsibility for tackling it . 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 . In any circumstances in Africa for now , the scenario of low coping capacities exists . While primarily recognized as a poet , his career as an artist has increasingly been seen as significant . Precipitation changes will also affect streamflow and the availability of irrigation.In regions where irrigation depends on melting snow , as in much of South Asia , the retreat of glaciers and reduction in snowfall could have grave consequences for water availability in summer ( Barnett and others 2005 ) . For example , the elimination of apartheid in South Africa in 1994 helped to reduce the marginalization of most of the people to the abundant resources in their own country . Another is that some products of incomplete combustion – particularly methane and black carbon particles – are even more powerful greenhouse pollutants than carbon dioxide , and therefore have higher global warming potential . He was the most directly involved of any British poet in the centres of political power and in the great historical events of the English Revolution . Cataloged items should also show up as held by USC in worldcat / OCLC but will not have any of the copy-specific information there that our own on-line catalogue adds for items in Special Collections . As a young professor at Princeton in the early seventies , he began focusing on the history of Milton illustration , and with his wife Pat and the late Robert H. Taylor , past president of the Grolier Club , he visited and established friendships with many of the best-known antiquarian bookdealers on both sides of the Atlantic . A recent study on the effects of global warming on rice yields in the Philippines found that yields declined by ten per cent for each 1 ° C increase in mean daily minimum ( night-time ) temperature in the growing season ( Peng and others 2004 ) . Water use grows under each of the scenarios , as populations expand and incomes grow . However , both Mazzini and Garibaldi acknowledged the meeting , and the author of this book , an Englishwoman married to an Italian revolutionary , was a friend of both men .