Mercer selected Impax Asset Management to manage $125 million of its sustainable global equity fund, a spokeswoman said.
The fund is offered by Mercer's delegated solutions, which runs the assets of defined contribution and defined benefit plans, endowments and foundations globally, excluding clients from North America.
Impax's strategy seeks mispriced companies that address social issues such as growing populations, rising living standards, increasing urbanization, rising consumption and the depletion of limited natural resources.
A Mercer spokeswoman declined to provide further details.