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The remaining 10 to 20 per cent is diverted into products of incomplete combustion — primarily carbon monoxide , but including benzene , 1,3 - butadiene , formaldehyde , polyaromatic hydrocarbons , and many other compounds posing health hazards ( Smith and others 2000 ) . This volume includes diagrams of the various " intellectual " and " affective " areas of the head . 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 ) . Only the Latin America and the Caribbean region showed a decrease during 2002 , of 2.4 per cent . Although a wide variety of technologies are available for monitoring air pollutants , economic and skill-related problems limit their use in many regions . Even shifting to clean-burning fossil fuels could be considered a GHG-reduction measure in places where wood is not harvested renewably , because it reduces emissions of methane and black carbon , as well as of CO2 ( Smith and others 2000 ) . In Southern Africa , loss of indigenous knowledge and inadequate protection of intellectual property rights are hampering conservation measures , as are overharvesting ( legal and illegal ) of medicinal plant species , rare and endangered plants , and " trophy " animals and exotic pets . " His six essays are on money , humility and independence , choice in marriage , wisdom , children , and " the life poetic . The Johannesburg Plan of Implementation , agreed at the World Summit on Sustainable Development in 2002 , includes commitments to diversify energy supply and to increase substantially the global share of renewable energy sources ; to improve access to reliable , affordable , economically viable , socially acceptable and environmentally sound energy services and resources ; and to establish domestic programmes for energy efficiency , among other things .