Carbon dioxide (CO2) makes up the vast majority of greenhouse gas emissions from the sector, but smaller amounts of methane (CH4) and nitrous oxide (N2O) are also emitted. These gases are released during the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity and other uses. Of the total emissions of greenhouse gas, about 28% of the emission originates from the transportation sector, whereas electricity production contributes 27% of emission followed by industries with 22%. Because of greater supply and cheaper prices, natural gas usage has surged, with an attendant 2.6 percent increase in carbon dioxide emissions for 2019.

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In fact, rising natural gas use accounts for 60 percent of fossil emissions growth in recent years. However, the recent advancements in the sector of green hydrogen energy have given hope to farewell fossil fuels. Developments and researches for green hydrogen use in the transportation sector from fuel cell ships to cars and trucks, and planes, agriculture sector, and from industries to smart cities have raised the momentum on green hydrogen fuel. The massive impact of carbon dioxide and other harmful emissions from fossil fuels is causing the degradation of both the health and property but also the non-renewability of them is propelling Scientists, engineers, investors, and politicians to discuss and advance on the alternatives of fossil fuels.