Conflict of interest perceptions mean Matt Kean should choose between his job as chairman of the federal government’s Climate Change Authority or working for a private energy transition fund led by a former Macquarie banker, a former top public servant and a fan of the ex-NSW treasurer says.

Wollemi Capital stands to make millions of dollars from investing in carbon credits – the same emissions offsets generated from carbon farming that the authority advises the government on and over which it influences the value.