I tried saving it a bunch of ways but I don't see the significantly smaller text. I also don't see the "NewsGOT" font in the properties of the resulting PDF. So it may be bitmapping it.

I do notice in your screen image, the phrase "et al" is the larger size. I am looking at that page again and it looks like you may have put CO2 in, with the subscript 2, as an equation rather than manually subscripted 2 or using the ALT+8322 ASCII character for the subscript 2. You might try saving a copy and changing those and any other instances of CO2 to just a C, O, and the ALT+8322 character, and see if that makes the issue go away. Or temporarily remove that whole paragraph, and PDF and see what happens.

I had a weird issue a while back with ArialMT showing up in a PDF of a report, when that font was not used at all in the text of it. I ended up breaking the document into sections and pages, and eventually figured out it only showed up on the pages where there happened to be a bullet point. So, deleting the bullets and replacing them manually with an ASCII character and a manual indent was the only way to keep the document from having the font, which the end client objected to.

Ann