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In this paper, we study the pricing and carbon abatement decisions of a manufacturer who sells products to consumers with environmental awareness through an online platform and an offline channel. The platform operates with marketplace or reselling mode. Cross‐channel spillover effect (CSE) is taken into account to reflect the impact of online channel sales on offline channel sales. With marketplace mode, the manufacturer directly sells its products to consumers on the platform, paying a commission to the platform for each order. With reselling mode, the manufacturer wholesales products to the platform, who then retails them to consumers. We find that the increase in the cross‐channel effect can positively affect the carbon abatement level, the production quantity and the profits of the manufacturer and platform. Marketplace (reselling) mode provides the manufacturer with more profits than reselling (marketplace) mode and induces the manufacturer to adopt greener technology if the CSE is high (low). Marketplace mode cannot coordinate the manufacturer and platform, while reselling mode can if the CSE is negative. We also extend the models to the case under omnichannel strategy and find that omnichannel strategy leads to higher carbon abatement level and brings more profit to the manufacturer under certain conditions. In addition, marketplace mode cannot coordinate the manufacturer and platform, while reselling mode always can. The findings in this paper not only enrich the theoretical research in platform‐based and low‐carbon operations management but also guide the management practice in these aspects.

This paper considers a manufacturer selling his products with the marketplace or the reselling mode under the cap‐and‐trade regulation. Coupons are allocated when selling the products. We explore the optimal decisions, the selection and the coordination with the two modes. First, we analytically find that the increase of the cap and platform power (commission rate) increases (decreases) the total production quantity and the optimal production quantity for coupon‐sensitive consumers, and interestingly find that it reduces (increases) the production quantity for coupon‐insensitive consumers when the sensitivity of the coupons is high. Furthermore, the optimal profit of the manufacturer first increases and then decreases with the cap when the emission intensity is low, and it increases with the cap when the emission intensity is high. Second, the marketplace mode creates more (less) profits for the manufacturer if the order‐fulfillment cost is low (high). Whether the marketplace mode or the reselling mode will generate more carbon emission depends on the commission rate and the platform power. Finally, the marketplace mode is not capable of coordinating the manufacturer and the platform at all times, while the reselling mode can coordinate the two firms after considering a coupon‐sharing contract under considerable platform power, and they can achieve Pareto improvement with a two‐part tariff contract under the generalized Nash bargaining framework.

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Cataract is the first cause of blindness and the major cause of visual impairment worldwide. Under conditions of global warming, researchers have begun to give attention to the influence of increasing temperature on cataract patients. Our paper aimed to investigate the association between extreme heat and hospital admissions for cataract in Hefei, China. Based on data from the New Rural Cooperative Medical System and National Meteorological Information Center, we used a generalized additive model and a distributed lag nonlinear model to examine the relationship between extreme heat and hospitalizations for cataract, with consideration of cumulative and lagged effects. When current mean temperature was above 28 °C, each 1 °C rise was associated with a 4% decrease in the number of cataract admissions (RR = 0.96, 95% CI = 0.94–0.98). The cumulative relative risk over 11 days of lag was the lowest, which indicated that every 1 °C increase in mean temperature above 28 °C was associated with a 19% decrease in the number of hospital admissions for cataract (RR = 0.81, 95% CI = 0.75–0.88). In subgroup analyses, the negative association between extreme heat and hospital admissions for cataract was stronger among patients who were not admitted to provincial-level hospitals. In conclusion, this paper found that extreme heat was negatively associated with cataract hospitalizations in Hefei, providing useful information for hospitals and policymakers.