The Greenhouse Gas Protocol, a widely used international environmental standard for measuring and reporting emissions, is considering changes to how certain types of the emissions are reported. Advocates for the new guidance argue that the current rules make it too easy for businesses to overstate their commitments to environmentally friendly operations, such as being powered by renewable energy or making progress toward net-zero emissions.

Today, some major tech companies joined a call pushing back against the new guidance, asking for the new reporting rules to be optional rather than required. The joint statement argued that the proposed policies would reduce investments in sustainability programs and increase electricity prices. Apple and Amazon are among the more than 60 companies that signed the letter, Bloomberg reported.

The protocol’s three tiers of emissions present a clearer picture about companies’ environmental efforts and how impactful they are in reducing emissions. Scope 1 includes emissions from sources directly owned or controlled by a business, while Scope 2 covers “how corporations measure emissions from purchased or acquired electricity, steam, heat and cooling.” Scope 3 is the catch-all for any other emissions produced within a business’ value chain. New proposed changes to the scope 2 guidance would place tighter requirements on how companies use renewable energy certificates to offset their electricity emissions. Rather than purchase clean energy certificates at any point during the year, companies would have to source clean energy that is both geographically close and simultaneously available to their grid-derived power. Any changes adopted by the Greenhouse Gas Protocol could take effect as early as next year.