Leaders of the Group of 20 wealthy economies are preparing to pledge to stop funding foreign coal-fired plants, but are still wrangling over climate objectives that are crucial to keeping global temperatures in check, according to a draft statement for this weekend’s summit.

The 11-page document seen by Bloomberg, which is still being negotiated by diplomats in Rome ahead of the meeting, shows key deliverables have yet to be agreed. The draft, dated Thursday, refers to the “existential challenge” of climate change.