Even proxy advisers are split over mining’s emissions debate

Key investor advisory groups are divided on whether Rio Tinto shareholders should support a demand for the world’s No. 2 miner to extend the range of its targets to reduce greenhouse gas emissions.

Institutional Shareholder Services is recommending Rio investors support a resolution tabled by an advocacy group calling on the producer to add additional targets, including so-called scope 3 emissions — those generated by customers through the use of its products. In contrast, Glass Lewis & advises holders to reject the plan at an annual meeting on Thursday.