Aviva Investors, BMO Global Asset Management and Aegon Asset Management are among a cohort of fund management heavyweights that have written to fast-food giants including McDonald’s and Domino’s Pizza urging them to tackle climate change and water risks across their sector.

The fund managers are among a group of 80 investors representing around $6.5tn in assets that have contacted six of the largest fast-food companies to “act urgently” on the environmental impact associated with the meat and dairy producers that supply their businesses.