Googling the cosignatories names revelas that several work for Exxon. I don't see how the WSJ didn't consider this relevant information to disclose, instead presenting them only as 'distinguished scientists.'
If you're going to make allegations of that sort, you should at probably list the "several" who you conclude "work for" Exxon. Better yet, link your sources.
It's a WSJ editorial. They probably wouldn't consider it relevant info if the article writer worked for Exxon.