Adopting the Broadband China Strategy as a quasi-natural experiment, we construct a multi-period Difference-in-Differences (DID) model to examine the impact of digital infrastructure construction on corporate innovation efficiency with panel data from Chinese listed companies between 2010 to 2022. Our findings indicate that the development of digital infrastructure significantly boosts corporate innovation efficiency. Mechanistic analysis reveals that financing constraints negatively moderates this innovation impact, while human capital positively moderates it. The effects of the Broadband China Strategy are particularly pronounced in non-state-owned enterprises, non-high-tech enterprises, and firms located in the non-eastern region of China. Our research provides important insights for enterprises seeking to enhance their innovation efficiency, while also offering strong empirical evidence on the role of digital infrastructure in fostering corporate innovation. Our study contributes to the literature on digital economy and innovation, with practical implications for policymakers and firms aiming to leverage digital infrastructure for sustained competitive advantage.

The Paris Agreement (PA), an authoritative political document on emissions reduction and low-carbon initiatives, requires the transportation sector to take decisive action toward achieving low-carbon objectives. This study uses CiteSpace to conduct a bibliometric analysis of 746 transportation sector low-carbon (TSLC) research articles published since the PA. The analysis reveals that China, the United States, and the United Kingdom are the leading contributors, with Tsinghua University being the most prolific institution. Sustainability, the Journal of Cleaner Production, and Transportation Research Part D are the most influential in terms of publication volume. This study reviews recent studies of TSLC from the perspective of renewable energy and technology applications, the evolution of intelligent transport systems, policy support, and public participation. Then, an in-depth interpretation of the potential impacts of low-carbon policies on the circulation of transport commodities, the energy system, the transportation system, and socioeconomic development is conducted. Finally, a knowledge map is presented, illustrating pathways for achieving TSLC targets under the guidance of the PA, laying a foundation for future research and policy efforts in sustainable transport.