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Recently there has been growing concern over the hemispheric-scale transport of pollutants , including black carbon particles ( Box 5 ) , and tropospheric ozone ( Figure 9 ) . When properly planned and managed , urban areas are capable of promoting human development , whilst effectively managing the extent of their impact on the natural environment . This inaccurate biography and mangled text gave the world a woefully biased picture of Burns ( for instance that he was a drunkard , when his letters and contemporary reports about him shed quite a different light on him ) , a picture which persisted well into this century . Non-toxic and clean-burning dimethyl ether ( DME , sometimes called ‘ synthetic LPG ’ ) shows promise as a clean non-toxic fuel that can meet the same markets now served by LPG . This novel falls into the later nineteenth-century sensational genre which had as a central figure the unconventional , cynical , and slightly amoral anti-hero .