The two organizations 'paired up' to educate the public about the threat of global warming.
I can't do everything at once—I've only got 'one pair of hands'. [=I am only one person]
To avoid competition, breeding/mating 'pairs' stay away from other male chimpanzees.
(..) CASSIEL: Angels aren't human. CASSIEL: We were never human. What if I just make her a little pair of wings out of paper? Tell her the truth. SETH: I told her. CASSIEL: How did she take it? (..)1998 City of Angels