Question

Substance causing global warming in the exhaust of fossil fuel fired power plants and cars is

• A. Carbon dioxide
• B. Particulate matter
• C. Nitrogen dioxide
• D. Sulphur dioxide

Answer 1

The correct option is A Carbon dioxide

Most cars use fossil fuel like petroleum and diesel. Few power plants which generate electricity also use fossil fuel. Among the gases given out after combustion, carbon dioxide ($20\%$contribution) causes global warming. Other causes of global warming are water vapour ($60\%$) and methane ($5\%$). These gases are called greenhouse gases.
Nitrogen dioxide and sulfur dioxide, given out of fossil fuel combustion, cause acid rain.
Particulate matter released from fossil fuels causes respiratory problems.