Transforming the greenhouse gas into fuels via sunlight has attracted great interests recently, but where are we and where should we go for a solar fuel refinery? To answer this question, Alex, who is the Co-founder and CEO of the solar fuel spinoff Solistra, analyzes the remaining technical challenges associated with the commercial application for dry reforming with coauthors. It is discovered that many photocatalysts reported in literatures have activity merits high enough for potential implementations while major challenge lies in chemical engineering such as the design of photoreactor. See full story at EES.