Abstract. With the development of the information technology and economic globalization, cross-border e-commerce has become a new growth point of economic development of foreign trade. It is a new driving force to promote the upgrading of industrial structure. This paper analyzes the advantages, disadvantages, opportunities and challenges in the development of cross-border e-commerce. With the implementation of the "Internet Plus" and "The Belt and Road", China's cross-border e-commerce market is broad, but it has disadvantages in the logistics, payment, credit system and still faces the challenges of foreign enterprises. Based on this, this paper puts forward the related solutions and suggestions from the view of government, enterprises and universities to make cross-border e-commerce ecosystem more perfect.

Abstract-The basic policy tools to regulate greenhouse gas emissions are the carbon taxes and the carbon emissions right trading. In theory, they have equivalents in the efficiency and effectiveness of carbon emissions reduction. However, due to the uncertainty of real world, so they no longer have theoretical equivalent, but difference. Therefore, it is necessary on the basis of the reality of socio-economic development and changes to choice and implement the most effective policy instruments. In the selection and design of specific policies, the diversification, stability and dynamic adjustment of policy objectives, the balance and coordination between international policies, as well as the interaction and coordination between different polices, should fully be considered.Index Terms-Greenhouse gas emissions, policy instruments, carbon tax, carbon emissions right trading, uncertainty.

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