Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)

Aerial photo taken on Aug. 29, 2018 shows a view of red land in the Dongchuan District of Kunming, capital of southwest China's Yunnan Province. (Xinhua/Yang Zongyou)