This website breaks it down pretty clearly: http://www.skepticalscience.com/Empirical-evidence-that-humans-are-causing-global-warming.html. It is not argued that the Earth is experiencing a global warming. The burning of fossil fuels emits greenhouse gasses and CO2. CO2 traps heat. Both CO2 levels and the temperature have risen dramatically since the dawn of serious human industry.
If you agree with me that Intergovernmental Panel on Climate Change (IPCC) is the epitomy of scientific consensus (it brings together leading WORLDS’ scientists), then their latest report shows that changes in the atmosphere, the oceans, glaciers and ice caps now show unequivocally that the world is warming due to human activities. I encourage you to read the report in its entirety here:
To summarize, humans’ emissions of CO2, methane, nitrous oxide and other greenhouse gases are the reason of global warming observed since the middle of the 20th century.
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