As China has planned for carbon peak and carbon neutralization, the country's ecological environment governance has entered a new stage of comprehensive integration and collaborative governance of pollution reduction and carbon reduction. Carbon reduction is the key to achieving carbon peaking and carbon neutrality goals. Therefore, to synergize the reduction of pollution and carbon emissions, the service mode of environmental stewardship needs to be comprehensively upgraded to provide carbon management services. Based on the analysis of the current situation and problems of environmental stewardship, it was proposed that upgrading environmental stewardship was a policy requirement for synergizing the reduction of pollution and carbon emissions, a practical request for achieving the goals of peaking carbon emissions and subsequent carbon neutrality and reducing enterprise performance costs, and also a future development trend of improving energy conservation and environmental protection technology. Finally, it was suggested that the upgrading of environmental stewardship service mode under the dual carbon target could be promoted from six aspects, including improving the relevant policy system, expanding the financing channels, promoting independent research and development of green and low-carbon technologies, building a scientific management platform for pollution reduction and carbon reduction, cultivating professional carbon asset managers and setting up innovative demonstrations.