The need to limit climate change, which is an urgent challenge for global society, requires encouraging discontinuous innovations that will dramatically change our society. In line with the "Environment Innovation Strategy", various companies and organizations are challenging innovations toward a decarbonized society. In order to promote collaboration between the companies and organizations for accelerating the creation of innovations, this study aims to structure innovation challenges towards a decarbonized society, by conducting text mining of "Challenge Zero" initiative by Keidanren (Japan Business Federation). Cluster analysis and correspondence analysis are performed to identify common keywords from the challenges and show the relationship between the keywords and industries. Correspondence analysis plots show that the keywords and industries can be classified into three categories: "electrification", "energy decarbonization" and "finance".