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It is expected that a warming of 4 ☌ and sea-level rise of 0.5–1 m can occur as early as 2060s (Huddleston 2012). Unless the current mitigation, commitments, and pledges are fully implemented, the negative effects of climate change will go on. 2012 Meyssignac and Cazenave 2012 McKechnie and Wolf 2010 Li et al. The major ones of these effects are average 0.8 ☌ global warming above pre-industrial levels, 0.09 ☌ warming and acidifying of ocean since 1950s, 3.2 cm sea-levels rising per decade, an exceptional number of extreme heat waves in last decade, and drought affecting food crop growing areas (Levitus et al. It is seen as the second most serious issue that the world faces and has brought about results that affect life adversely (European Commission 2011). At the same time, the legal restrictions on exhaust-gas emissions around the world and the effects of exhaust-gas emissions on human health and environment are explained in this study.Ĭlimate change is being counted as a global environmental threat caused by people.
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Each type of emissions and control systems is comprehensively examined. The four main pollutant emissions from diesel engines (carbon monoxide-CO, hydrocarbons-HC, particulate matter-PM and nitrogen oxides-NO x) and control systems for these emissions (diesel oxidation catalyst, diesel particulate filter and selective catalytic reduction) are discussed. In this paper, the emissions from diesel engines and their control systems are reviewed. Many researches have been carried out on both diesel exhaust pollutant emissions and aftertreatment emission control technologies. Many policies have been imposed worldwide in recent years to reduce negative effects of diesel engine emissions on human health and environment. Diesel engines are considered as one of the largest contributors to environmental pollution caused by exhaust emissions, and they are responsible for several health problems as well. In addition to the widespread use of these engines with many advantages, they play an important role in environmental pollution problems worldwide. The interest in diesel engines has risen substantially day by day. These important features make them the most preferred engines especially for heavy-duty vehicles. Diesel engines have high efficiency, durability, and reliability together with their low-operating cost.