If coral reefs are a ‘canary in the coal mine’ of climate change, then the future is looking ominous. The Reef Restoration and Adaptation Program, a consortium of Australian governmental research organizations and universities, was established to investigate options for helping the Great Barrier Reef survive climate change. Of the options under consideration, Marine Cloud Brightening (MCB) has consistently topped evaluations of future benefit. But can this potential be realized? In this session, we heard from oceanographer and engineer Dr. Daniel Harrison, who leads a pioneering MCB technology development and outdoor field testing effort, with deep community involvement and regulatory oversight.