CBSE Class 10 Science 2019 · Paper 31/2/2 · Question 10

Three environmental consequences of using fossil fuels: air pollution - smoke, soot and gases such as carbon monoxide are released; acid rain - the acidic oxides of sulphur and nitrogen dissolve in rainwater and harm water and soil resources; the greenhouse effect - more carbon dioxide in the air holds back more heat, causing global warming. Steps to minimise the pollution: use alternative, cleaner sources of energy such as solar, wind and hydro energy; use devices such as filters in chimneys and catalytic converters in vehicles to reduce the escape of harmful gases and ash; increase the efficiency of the combustion process so that fuels burn completely. (Other correct steps, such as saving energy, also earn credit.)