Sky News Australia: Australia and the United States have forged a pact to fight climate change by agreeing on a new solar research collaboration. Prime Minister Julia Gillard announced the deal at a climate change event in Melbourne attended by US Secretary of State Hillary Clinton. Ms Clinton is in Melbourne for tomorrow’s AUSMIN talks. Earlier today, the Secretary of State had a guided tour of Melbourne amid tight security, taking in the landmarks in the C-B-D. Ms Clinton has a jam-packed schedule today – this…