All I know is UNESCO just moved office so address might not be current, the person i have meet/dealt with is a German guy caled Benno Boer, good chap, who is in charge of programme development for natural sciences, the web site explains www.unesco.org/doha

http://portal.unesco.org/en/ev.php-URL_ID=2130&URL_DO=DO_TOPIC&URL_SECTI...

Best of luck, they large institutions can be rather slow moving - if your fiield of interest is "environmental" then i can help with other local entities. Cheers,