AAP: Kevin Rudd and Tony Abbott will use the resumption of parliament this week to push their climate change credentials, setting up a political stoush likely to run until election day. The two leaders will square off in the lower house for the first time on Tuesday, following Mr Abbott’s surprise election as opposition leader during a Liberal partyroom ballot in December. Mr Abbott intends to fire the first shot before the house resumes from its two-month summer break by unveiling …