The document discusses sources of carbon dioxide emissions. It states that natural sources include decomposition, ocean release and respiration, while human sources come from activities like cement production, deforestation, and burning fossil fuels. It notes that human sources have increased carbon dioxide levels since the Industrial Revolution to dangerous levels not seen in 3 million years by upsetting the natural balance. It further explains that 87% of human carbon dioxide emissions come from burning fossil fuels, while the remainder results from

1. Sources of carbon dioxide'
SOURCES OF GREENHOUSE GASSES
CARBONDIOXIDE
There are both natural and human sources of carbon dioxide emissions. Natural sources includedecomposition, ocean release and respiration. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas.
Due to human activities, the atmospheric concentrationof carbon dioxide has been rising extensively since the Industrial Revolution and has now reached dangerouslevels not seen in the last 3 million years.1 2 3 Human sources of carbon dioxide emissions are much smallerthan natural emissions but they have upset the natural balance that existed for many thousands of years before the influenceof humans.
This is because natural sinks remove around the same quantity of carbon dioxide from the atmosphere than are produced by natural sources.4 This had kept carbon dioxide levels balanced and in a safe range. But human sources of emissionshave upset the natural balance by adding extra carbon dioxide to the atmosphere without removing any
Carbon Dioxide Emissions: Human Sources
Since the Industrial Revolution, human sources of carbon dioxide emissionshave been growing. Human activities such as the burning of oil, coal and gas, as well as deforestation are the primary cause of the increasedcarbon dioxide concentrations in the atmosphere.
87 percent of all human-produced carbon dioxide emissionscome from the burning of fossil fuels like coal, natural gas and oil. The remainder results from the clearing of forests and other land use changes (9%), as well as some industrialprocesses such as cement manufacturing (4%)
Certainly! Here is a more detailed explanation of the sources of greenhousegases:
1. **Carbon Dioxide (CO2):**
- **Fossil Fuel Combustion:** The burning of fossil fuels such as coal, oil, and natural gas for electricity generation, heating, and transportation is the largest human source of CO2 emissions. This occurs in power plants, industrialfacilities, and vehicles.
- **Deforestation:**When forests are cut down or burned, the carbon stored in trees is released as CO2. This happens for reasons like agriculturalexpansion, logging, and urban development.
- **Land Use Changes:** Converting natural ecosystems into agricultural or urban areas releases carbon stored in vegetation and soil into the atmosphere.
- **Waste Management:**Landfillsare a source of CO2 emissions as organic waste decomposes anaerobically, producing methane (CH4) and CO2.