To be a unique carbon sink, agriculture as the first industry has double performance to reduce carbon emission and to absorb as well as resolve carbon. It thus exists as an important pillar for realizing national target of carbon neutrality. The socalled agro-forestry engineering for carbon neutrality refers to a comprehensive engineering that considerably increases the capacity of carbon emission reduction and carbon reservation through science-guided plantation on three kinds of land, i.e., arable land, forest land, and marginal land which is not suitable for crop cultivation but can be planted with dedicated energy bushes and grasses for their strong resilience. The size of such three carbon neutral grounds totals 465 million hectares, or 135 million, 186 million and 144 million hectares, respectively. The potential capability for adding carbon sink and biomassconverted energy are respectively 3.74 billion tons and 1.21 billion tce annually. The agro-forestry engineering simultaneously comprises environment protection, energy upgrading, agriculture fortification, countryside revitalization and benefiting peasants, thus it is regarded as a national treasure.

Fossil energy is the prime culprit for huge GHGs emission, covering almost 90 percent of the total amount. There has been a great deal of discussion about reducing GHGs in China, however, the biomass energy which is of carbon zero-emission characteristic has not been paid much attention. Furthermore, biomass's unique function of carbon negative emission is far from being recognized. This paper describes the mechanism of biomass's carbon negative emission and its theoretical potentials to China and the world. Several real practical and feasible ways, particularly the way of reducing biomass-derived methane, for carbon negative emission are probed. It is discovered that biomass-derived carbon sequestration is far superior to geological CO₂ storage, and highly feasible as well. The world climate change circle pays much attention to the biomass's function of GHGs emission and to the effects of its unique carbon negative emission in particular. Someone even calls it the last prospect for realizing the global 1.5℃ scenario. The situation of severely ignoring biomass's great effects on GHGs reduction should be shifted as soon as possible.

It is of great significance to study the interaction between air quality and land intensive use and the influencing factors from the point of view of space matching. This paper uses trend surface, spatial autocorrelation, gravity model, spatial dislocation model, grey correlation model and other methods to analyze the spatial differentiation law, spatial matching relationship and driving factors of air quality and land intensive use level in 290 cities across China. The results are as follows 1) In 2017, the air quality in cities across the country showed a central-peripheral structure with the central and southern Hebei urban agglomeration as the core and gradually improved outward, being an obvious agglomeration characteristic; the level of intensive use of urban land across the country presented a multi-core spatial structure with the Beijing-Tianjin-Hebei, Yangtze River Delta, and Pearl River Delta urban agglomerations being the cores, and their agglomeration characteristics were also obvious. 2) The air quality and the level of intensive land use in cities across the country were not spatially coordinated and matched, and the negative dislocation areas were mainly distributed in the Beijing-Tianjin-Hebei and Yangtze River Delta urban agglomerations, and the dislocation intensity presented a core-periphery spatial structure, the positive dislocation areas were distributed in the northeast, southwest, northwest and southern coastal areas, and the dislocation intensity presented a spatial distribution pattern decreasing from southeast to northwest; contributions of spatial dislocation had obvious regional differences, especially in the eastern region(. 3) The overall correlation between the indicators of national urban air quality and land intensive use was strong, in which the concentration of pollutants that affect air quality, the vegetation NDVI that affects the intensive use of land, the greening rate of built-up areas, and the land factors such as the average discharge of industrial wastewater were the main reasons for the spatial dislocation of the two systems.

The European Commission published its European Green Deal by the end of 2019, proposing to take the lead in achieving carbon neutral by 2050. At the same time, the EU put forward seven green action plans and four supporting safeguard measures, as well as a clear emission reduction roadmap for the EU steel industry. This article discusses the background and significance of the Green Deal,and describes the requirements specified for various industries within the EU to achieve carbon neutral. This is then followed by a technical and economic comparison analysis for the technical route adopted in the steel road map. Finally the article deals with the EU's implementation policies and measures to reduce emissions, which may provide important reference for China's future sustainable development of steel industry.