Confusion about sentence structure!

Hi Everyone,

I was reading an article and want to ask some questions.

There was a following sentence

—including an increase in the world’s population, and with it greater consumption,
trade, and tourism

Now, I’m confused about the comma which is placed before “and”. ” and with it greater consumption” is a new sentence. Is it right to start a new sentence with “and”?

Similarly, can we start a new sentence with “as” and ” but”?

I’ll be grateful if you’ll explain it with the help of some examples.

Regards

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