The destruction of the surrounding environment in Chang 'an and Luoyang began in the Tang Dynasty. . After the Five Dynasties, there was no capital here for 1000 years.
Take the Royal Bamboo Garden near Chang 'an in the Western Han Dynasty as an example. Sima Qian saw more than 2,000 mu of bamboo gardens in the Western Han Dynasty, more than 0/000 mu in the Sui Dynasty and more than 600 mu in the early Tang Dynasty, all of which were opened up as wheat fields in the era of Wu Zetian. . By the time of Tang Xianzong, it had become a wasteland. . . .
The decline of Chang 'an and Luoyang is a powerful proof that the natural environment has been destroyed.