Amazon CEO Jeff Bezos recently pledged to invest $10 billion of his money into an initiative to fight climate change, but he did not provide many details about where the money will go. His announcement placed renewed attention on his company’s large carbon footprint — which a group of Amazon employee activists have long challenged — and raised bigger questions about how to respond to the ultra-wealthy’s charitable giving efforts.

Phil Buchanan, president of the Center for Effective Philanthropy and author of "Giving Done Right: Effective Philanthropy and Making Every Dollar Count," Emily Barman, professor of sociology at Boston University and author of "Caring Capitalism: The Meaning and Measure of Social Value in the Market," and Michael Serazio, an associate professor of communication at Boston College and the author of ‘Your Ad Here: The Cool Sell of Guerilla Marketing,’ spoke with Jim Braude Thursday on Greater Boston.