ESG investing has quickly grown into an important institution on Wall Street. But what types of rules govern whether an investment can tout itself as good for the environment, social justice, or corporate governance?

It may surprise you, but there aren't that many.

On today's episode of our weekly podcast, Parts Per Billion, we hear from Bloomberg Law reporter Andrew Ramonas about why this is the case and about the efforts underway in both the public and private sectors to establish a stronger set of rules over who gets to don the ESG halo.

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