Are collectively and overall synonyms?
- Industries and people's life-style cause 80% increase in the air pollution collectively.
- Industries and people's life-style cause 80% increase in the air pollution overall.
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No, collectively and overall are not exactly the same thing. The usage is a bit different. Also, please note the corrections.
2-Industries and people's life-styles cause an 80% increase in air pollution overall. This is the better sentence.
Overall can go at the beginning or end. Overall, [etc.]
Collectively is not good for referring to two completely disparate things.
All industries collectively = together. Different industries taken as a whole or taken together. The chemical industry and the oil industry, collectively, etc. [both are industries]
Unless you are referring to air pollution in a specific place, I would remove the "the".