4.13 understand how human activities contribute to greenhouse gases

 Combustion of organic compounds (fossil fuels):

Many of human daily activities produce large quantities of greenhouse gases. The burning of fossil fuels in factories is one of the main sources of carbon dioxide. Many other hydrocarbon compounds release carbon dioxide/ other greenhouse gases during combustion.

Deforestation:

Without the trees to regulate carbon dioxide concentration, there is an increase of CO2 in the atmosphere and a decrease of O2 levels. Trees are also used as fuels and the burning of wood releases carbon dioxide as well.

Farming:

Other human activities such as the industrial process of livestock are other contributors of greenhouse gases such as methane. Cows produce methane as they digest and the large numbers of cows that are being grown for human consumption means that they are a significant contributor of methane in the atmosphere.

Landfill sites:

Landfill sites contribute to greenhouse gases because during the process of decomposition, the bacteria decompose organic materials. As a result, landfill gases are mostly composed of carbon dioxide and methane.