Either is correct, but mentioned is more idiomatic. If you were talking about a past conversation you had with a person, rather than reading an article, then it would be clear that the mentioning took place in the past: Last week I talked to Jim, and he mentioned how human activities are causing global warming.
How do you use mention in a sentence?
Mention sentence example
- He didn't even mention her family. ...
- There was no point alarming Connie about her situation, so she didn't mention the conversation with Giddon that had inspired the letter. ...
- If you mention his name to Alex, you'll find out why she feels that way.
Which word to use have or has?
Have is the root VERB and is generally used alongside the PRONOUNS I / You / We / Ye and They and PLURAL NOUNS. Generally, have is a PRESENT TENSE word. Has is used alongside the PRONOUNS He / She / It and Who and SINGULAR NOUNS. However, there are some exceptions which will be explained later on in the lesson.