Business Green: The building industry has rejected accusations that it is looking to water down the government’s target of ensuring all new homes are zero carbon by 2016, insisting it remains widely committed to meeting zero-carbon standards. The Zero Carbon Hub, the body set up to administer the policy, is testing a range of definitions for what constitutes a zero-carbon home and the government is expected to deliver a decision on the final definition in the coming months. It had been widely …