He has deleted my article on "Impact of global climate change on agriculture" which took me hours to write, to redirect it to [[climate change]]
What do you mean, deleted? I'm not sure I understand. The article has no history except for BigFatBuddha's edit, and it is not in the archive of deleted pages. I also don't remember BigFatBuddha being made a sysop -- he's not listed on Wikipedia:Administrators. If he is a sysop, and has bypassed the Votes for deletion page, his sysop status should be revoked immediately.
Regards,
Erik