This paper considers the pattens of international collaboration by analysing publications on COVID‐19 published in the first 6 months of the pandemic. The data set comprised articles on COVID‐19 indexed in the Web of Science Core Collection (WoS CC) downloaded four times between 1 April 2020 and 1 June 2020. The analysis of 5,827 documents revealed that 128 countries, 23,127 authors, and 6,349 institutes published on the pandemic. The data reveal that the three main publishing countries were the USA, China, and England with Italy closely following. Although publication was widely spread, most of the institutions with the highest volume of output were in China. Network analysis showed growth in international cooperation with an average degree of country/region cooperation rising to 23.06 by 1 June. There was also a clear core‐periphery structure to international collaboration. Institutional collaboration was shown to be highly regionalized. The data reveal a high and growing incidence of international collaboration on the pandemic.

Promoting environmental innovation through environmental regulation is a key measure for cities to reduce environmental pressure; however, the role of environmental regulation in environmental innovation is controversial. This study used the number of environmental patent applications to measure urban environmental innovation and analyzed the role of urban environmental regulation on urban environmental innovation with the help of the spatial Durbin model (SDM). The results showed that: (1) From 2007 to 2017, the number of environmental patent applications in China has grown rapidly, and technologies related to buildings dominated the development of China’s environmental innovation. (2) Although the number of cities participating in environmental innovation was increasing, China’s environmental innovation activities were highly concentrated in a few cities (Beijing, Shenzhen, and Shanghai), showing significant spatial correlation and spatial agglomeration characteristics. (3) Urban environmental regulation had a positive U-shaped relationship with urban environmental innovation capability, which was consistent with what the Porter hypothesis advocates.

Global climate change affects hydrology and ecology, and aggravates the contradiction between water resources supply and demand, thus leading to transboundary water conflict and cooperation attracting increasing attention. This paper uses the precipitation data sourced from the Global Precipitation Climatology Centre, hydropolitical data collected from the Transboundary Freshwater Disputes Database and, for approximately half a century of socioeconomic indicator for countries, to discuss the relationship between precipitation change and transboundary hydropolitics. As demonstrated by the panel regression results, lower precipitation would lead to more water conflicts and more significant change of precipitation would lead to more water hydropolitical events. This result remains robust after adjustment being made to the defined thresholds of conflict and cooperation. The findings suggest that the countries in a transboundary river ought to avoid conflict and seek more cooperation, considering the uncertain prospect of precipitation changes.

Despite contributions, most of the studies on electronic‐telecommunications trade are conducted within the framework of a global value chain and mainly based on an enterprise‐level. The global trade structure and dynamics of electronic‐telecommunications are still mysterious. In this paper, by deriving trade data of electronic‐telecommunications between countries (regions) from the UN Comtrade Database, characteristics in product, space and network of the global electronic‐telecommunications trade from 2000 to 2017 are explored, and the factors influencing its evolution. The results indicate that telecommunications equipment is gradually replacing electronic integrated circuits, thus leading the development of global trade on electronic‐telecommunications. In space, the global import pattern of electronic‐telecommunications has always been a tri‐polar pattern dominated by Asia‐Pacific, Europe, and North America, while the geography of global electronic‐telecommunications export has undergone fundamental changes, most notably the rise of the East Asia region represented by Mainland China. The global trade center in electronic and communication products has changed from USA to China. In terms of network structure, the global electronic‐telecommunications trade network continues to expand, showing significant small‐world and core‐peripheral characteristics, and a more competitive multi‐centric core is observed. In addition, Quadratic Assignment Procedure analysis indicates that culture proximity, innovation differences, and manufacturing differences have a positive effect on the international trade, while geographical distance, economic gap, openness gap, trade gap, and infrastructure gap play negative roles.