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“三北”防护林工程 1978年经国家批准,建设范围有西北、华北、东北等13个省、市、自治区的551个县,面积达406.9万平方公里,占国土总面积的42.4％。工程预定2050年竣工,被称为“绿色万里长城”。整个工程分为三个阶段:1978～2000年为第一阶段,2001～2020为第二阶段,2021～2050年为第三阶段。第一阶段包括三期工程:第一期工程从1978年至1985年,共造林605.5万公顷,森林覆盖率由原来的4％提高到5.9％;第二期工程现正进行,为期10年,到期森林覆盖率从5.9％上
The “Three Norths” shelterbelt project was ratified by the state in 1978. Its construction scope covers 551 counties in 13 provinces, municipalities and autonomous regions in Northwest, North China and Northeast China, covering an area of 4,609,000 square kilometers, accounting for 42.4% of the total land area. The project is scheduled to be completed in 2050, known as the “Green Great Wall.” The whole project is divided into three stages: 1978 ~ 2000 for the first phase, 2001 ~ 2020 for the second phase, 2021 ~ 2050 for the third phase. The first phase includes the third phase of the project: the first phase of the project from 1978 to 1985, a total of 6,550,000 hectares of afforestation, forest coverage increased from 4% to 5.9%; the second phase of the project is now underway for a period of 10 years, Expiration forest coverage from 5.9%