Final answer:
The burning of fossil fuels by humans in 2012 introduced an increase in greenhouse gases, particularly carbon dioxide, into the atmosphere, leading to global climate change.
Step-by-step explanation:
The burning of fossil fuels by humans in 2012 introduced an increase in greenhouse gases, particularly carbon dioxide, into the atmosphere. This has contributed to global climate change, leading to rising temperatures and other climatic disturbances.
The burning of fossil fuels, such as coal, oil, and natural gas, releases carbon dioxide into the atmosphere. This increase in greenhouse gases traps heat and leads to global warming, impacting the Earth's climate.
Examples of human activities that burn fossil fuels include industrial processes, transportation, and the use of fossil fuel-powered machinery. These activities have significantly contributed to the rise in atmospheric carbon dioxide levels and its effects on the planet's climate.