Final answer:
The main cause of the current global warming trend is the steady increase in fossil-fuel burning since the Industrial Revolution, which has led to a rise in greenhouse gas levels.
Step-by-step explanation:
The main cause of the current global warming trend, as agreed upon by most scientists, is the steady increase in fossil-fuel burning since the Industrial Revolution. This process has led to a rise in greenhouse gas levels, particularly carbon dioxide, which trap more heat within the Earth's atmosphere, resulting in the observed rise in temperatures. The burning of fossil fuels is also associated with the release of other greenhouse gases like methane, contributing to the greenhouse effect and global warming.
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