Influence of alcohol blend fuels on performance and noise emission in spark ignition engine by Ali Murtaza Ansari, Liaquat Ali Memon, Faheem Ahmed Solangi, Mamdouh T. Ghannam, Mohamed Y.E. Selim

“…Using a single-cylinder, four-stroke engine with spark ignition, the effects of a gasoline/ethanol mix on power, efficiency, and exhaust emissions were evaluated. …”
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The greenhouse gas footprint of liquefied natural gas (LNG) exported from the United States by Robert W. Howarth

“…Surprisingly, the most modern tankers propelled by two‐ and four‐stroke engines have higher total greenhouse gas emissions than steam‐powered tankers, despite their greater fuel efficiency and lower CO2 emissions, due to methane slippage in their exhaust. …”
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