理论经济学至今否认包括草地资源在内的土地资源有价值。
Academic economics is denied up to now include meadow resource inside land natural resources is valuable.
产生土地退化的原因，不仅仅是土地资源特点与自然环境这样一些自然因素，还包括一些社会与经济因素。
The causes of land degradation not only include the natural factors, such as the characteristics of land resources and the natural environment, but also the social and economic factors.
理论经济学至今否认包括草地资源在内的土地资源有价值。
So far theoretical economy has denied the value of land resources, including grassland resources.
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