f ▁Ten hagen ▁worked ▁as ▁a ▁fre el ancer ; ▁among ▁other ▁things ▁he ▁did ▁an ▁intern ship ▁for ▁the ▁Associ ated ▁Press ▁news ▁ag ency ▁and ▁worked ▁for ▁local ▁radio ▁stations ▁in ▁Dort mund ▁and ▁G els enk ir chen - B uer . ▁From ▁ 1 9 9 1 ▁to ▁ 1 9 9 4 ▁he ▁was ▁an ▁environmental ▁journalist ▁for ▁the ▁die ▁T ages zeit ung ▁daily ▁newspaper ▁in ▁Berlin , ▁where ▁he ▁was ▁involved ▁in ▁setting ▁up ▁the ▁Environment ▁and ▁Econom y ▁Department ▁in ▁ 1 9 9 2 . ▁During ▁a ▁s abb at ical ▁year ▁he ▁then ▁worked ▁as ▁sp okes man ▁for ▁the ▁K lim a forum ▁ 9 5 ▁( the ▁J oint ▁Co ord ination ▁and ▁Information ▁Centre ▁of ▁German ▁Environment al ▁Organ is ations ) ▁and ▁helped ▁organ ise ▁the ▁activities ▁of ▁N GO s ▁during ▁the ▁first ▁world ▁climate ▁sum mit ▁in ▁Berlin ▁in ▁ 1 9 9 5 . ▁ ▁After ▁that ▁he ▁returned ▁to ▁the ▁die ▁T ages zeit ung ▁where ▁he ▁worked ▁from ▁ 1 9 9 5 ▁to ▁ 1 9 9 8 , ▁first ▁as ▁Head ▁of ▁Econom y ▁and ▁Environment , ▁and ▁then ▁for ▁the ▁last ▁two ▁years ▁also ▁as ▁the ▁Deput y ▁Editor - in - ch ief . ▁ ▁He ▁eventually ▁became ▁a ▁member ▁of ▁the ▁die ▁T ages zeit ung ▁co oper ative ▁Board . ▁In ▁ 1 9 9 8 ▁he ▁became ▁the ▁Head ▁News ▁Editor ▁of ▁the ▁Bad ische ▁Zeitung ▁in