Although the antecedents of environmental innovation and open innovation strategies have been well studied separately, the impact of a firm’s openness on environmental innovation remains largely unknown. This article considers the impact of three dimensions of open inbound innovation search strategies—acquiring, sharing, and information sourcing—on environmental product and process innovations and finds positive impacts in each case. Sharing mainly enhances environmental processes, and inbound innovation sourcing reveals that market sources of information from customers, suppliers, and competitors are positively associated with firms’ involvement in product and process environmental innovations at all levels. These findings have significant implications in terms of public policy and managerial insights, highlighting the importance of absorptive capacity as a moderator that stimulates environmental innovation. The results suggest substitution effects between acquiring inbound modes and internal R&D and between R&D cooperation and internal sources, as well as complementary effects between internal R&D and institutional information sources and internal sources and market sources of information.
