Many investors would like to use their money to help tackle climate change, but figuring out how has not always been easy. Now a fund that benefits 38,000 current and retired clergy and other employees of the Church of England could offer a potential solution.

The Church of England Pensions Board, which manages 2.8 billion pounds (or $3.7 billion), this week announced an index that rewards companies working to curb their carbon-dioxide emissions in line with the targets of the 2015 Paris agreement, and bars companies that are perceived as environmental laggards.

The church’s pension board is transferring £600 million to the new index, which it helped design with FTSE Russell, an index provider.

Companies that rate well under a series of metrics developed for the pension fund receive more weight in the index, meaning more of their shares will be purchased, while those that don’t score well will either receive reduced weight or be excluded.