Former Liberal Party leader John Hewson says he expects a "proliferation" of superannuation funds that are free from fossil fuels investments, as the global divestment movement attempts to convince super members to switch into "clean" funds.

Mr Hewson is an adviser to a new fossil-fuel free fund called Future Super, which has kicked off with about $3.6 million in savings and 100 members, and a managed investment scheme will be launched later this month.

Future Super is co-founded by Simon Sheikh, a former national director of activist group GetUp.

"You will see a proliferation of these sorts of funds," Mr Hewson said.

His involvement has been driven in part by "frustration that governments were dicking around with all sorts of policy solutions, and not doing very well, whether they were banning light bulbs or mandating biofuels, or moving to a carbon price".