"You may not care given your tenure in a nice comfy University lounge, but to others this affects income and jobs.
"Give that some thought next time you feel the need to see your name in print in New York. And possibly think of changing your name from Joy to Misery-its more accurate [sic]."
The emails were posted on Dr Norman's Facebook page this afternoon, and he said Unsworth's behavior implied he wanted scientists to gag them from their academic duty to report the facts of environmental degradation.
"It's disappointing. Dr Joy is simply reporting the evidence. The clean, green brand only exists because of people like Dr Joy."
Dr Norman said corporate lobbyists exploited New Zealand's '100% Pure' image but then attempt to stop any protection of the environment which it stands on.
Mr Unsworth did not wish to comment further beyond stating he stood by the emails and they were his own personal views.
Saunders Unsworth clients include Caltex, British Gas and Air New Zealand.