A majority (55 percent) of companies worldwide (by market cap) now report environmental data, according to CDP, yet some of the biggest companies that withhold environmental information such as their greenhouse gas emissions are the tech giants such as Amazon, Alibaba, Facebook and Netflix.

Brown and Espinosa, co-chairs of the Global Climate Action Summit in September, are calling for “at least 300 more companies and cities” to start reporting environmental data by the start of the summit in September.

Brown points out that reporting on carbon pollution keeps brands and governments accountable — announcing climate goals is not enough unless they are backed by bold climate action — which can be spurred by “honestly and fully reporting their emissions,” Governor Brown says.

More than 570 cities with a combined population of 608 million people, 100 states and regions across 88 countries, and 6,300 companies with 55 percent of global market capitalization have already taken urgent action by measuring and reporting their climate impact through CDP, formerly known as the Carbon Disclosure Project.

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