By Simon JessopLONDON (Reuters) -Japanese insurer Tokio Marine has set up a unit to insure activities linked to the low-carbon transition such as green hydrogen, shipping and cement and is targeting $1 billion in revenues by the end of the decade, its chair told Reuters.The new unit, Tokio Marine GX (TMGX), will provide advisory and risk transfer services to companies across a range of sectors looking...