At a "Your Weekly Address" of White House on August 13, I found the following sentence in a message by President Obama:
And carbon pollution from our energy sector is at its lowest level in 25 years, even as we’re continuing to grow our economy.
I wonder (or am confused) whether "from" is appropriate here to describe energy sector, or whether the preposition should be "in". So please explain the cases in which "in" or "from" should be used, or whether there is no difference at all (so I can use either one). Thank you.