Burning hydrogen produces no carbon dioxide (0.00 g). Carbon dioxide is a greenhouse gas which contributes to global warming/climate change. Therefore, using hydrogen helps to reduce the greenhouse effect.
By examining Table 2, we can compare the combustion products of hydrogen and natural gas.
- The row for "Mass of carbon dioxide produced" shows that burning 1 dm³ of hydrogen produces 0.00 g of CO₂, while natural gas produces 1.83 g.
- This is a significant positive impact because hydrogen fuel does not contain carbon atoms (it is just H₂), so it cannot produce carbon dioxide upon combustion. The only product is water (2H₂ + O₂ → 2H₂O).
- Carbon dioxide is a major greenhouse gas. It traps infrared radiation in the atmosphere, leading to an increase in the Earth's average temperature, known as global warming or climate change.
- Therefore, using hydrogen as a fuel instead of natural gas (which is mostly methane, CH₄) would eliminate these CO₂ emissions and help to mitigate climate change.