PepsiCo made history last week when it announced it would become the nation’s largest corporate purchaser of green power. The company will work with Sterling Planet, a renewable energy provider, to find and buy the certificates to account for the electricity used for all of its U.S.-based manufacturing facilities, distribution centers, regional offices and headquarters.

Deirdre Imus (not to be confused with the Imus she’s married to) may not do her own house cleaning, but she knows the chemical makeup of name-brand cleaning products and the environmental and public health dangers they can cause. And her new book: Green This! Volume One: Greening Your Cleaning (Simon and Schuster, $15.95), is a readable, practical how-to book on ridding your home of toxins.

This year’s recipients of the coveted Goldman Environmental Prize include a Vietnam vet fighting Pentagon nerve gas incineration, a champion of native forest dwellers terrorized in Liberia’s civil war, a researcher whose reports are helping China reconsider the socioeconomic and environmental impacts of dam construction, and an activist who helped stem the tide of illegal logging to establish the world’s largest area of protected tropical forest in northern Brazil.

New York City Mayor Michael Bloomberg used the occasion of Earth Day to unveil 127 new environmental initiatives aimed at greening Gotham over the next two decades. With the city likely to take on an additional million residents by 2030—up from 8.2 million now—Bloomberg thinks that addressing environmental issues now may be the only way to deal with the inevitable future strain on infrastructure and natural resources.