Global warming is most closely associated with increased industrialization such as factories, i.e., option b.
What is global warming?
The long-term heating of Earth's climate system since the pre-industrial period due to human activities, including fossil fuel burning, which increases heat-trapping gas levels in Earth's atmosphere is referred to as global warming.
Increased industrialization due to rapid population growth is also a cause of global warming because of the increased levels of harmful emissions.
Thus, the correct option is b.
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