When it comes to what contributes to carbon dioxide being released into the atmosphere, the burning of fossil fuels is a major factor. Fossil fuels such as coal, oil, and natural gas contain carbon that has been stored underground for millions of years. When these fuels are burned for energy, carbon dioxide is released into the atmosphere as a byproduct of combustion.
Additionally, the melting of polar ice caps indirectly contributes to the release of carbon dioxide. As the ice caps melt due to rising global temperatures, they release carbon dioxide that has been trapped in the ice for centuries, further adding to the levels of carbon dioxide in the atmosphere.
On the other hand, the fixing of nitrogen and planting of trees do not directly contribute to the release of carbon dioxide into the atmosphere. Fixing of nitrogen is a process where nitrogen from the atmosphere is converted into a form that plants can use, while planting trees helps in absorbing carbon dioxide through photosynthesis, thus reducing its presence in the atmosphere.
In summary:
1. Burning of fossil fuels - Major contributor to carbon dioxide release.
2. Melting of polar ice caps - Indirectly releases trapped carbon dioxide.
3. Fixing of nitrogen - Does not directly contribute to carbon dioxide release.
4. Planting of trees - Helps absorb carbon dioxide, reducing its presence in the atmosphere.
