I-Shanghai Shāngqiǎng Huánjìng Jìshù Yǒuxiàn Gōngsī (ebizwa ngokuthi "Shāngqiǎng Huánjìng", igama lesiNgisi: Dredoffff) iyinkampani ephethe ubuchwepheshe obuphakeme egxile ezinhlelweni zokuhlola isimo sezulu nezemvelo kanye nezixazululo zobuchwepheshe bokwakha obuhlaza. Ihhovisi elikhulu lenkampani likhona eChina, futhi selivele libhaliswe emakethe ye-Hong Kong Sanban (HKOTC), ikhodi yesitoko: HK2620.

       Inkampani yasungulwa ngo-2003, iyinkampani encane neyesikhumbuzo yezeMisebenzi. I-CEO yenkampani uMnu. Xu Xianmin ungumongameli weSikhungo sezeMali eChina, ungum member weNhlangano Yezizwe yeGlobal Compact, ungumgibeli ohloniphekile weNhlangano Yezizwe, futhi ungumkhiqizo ophakanyisiwe emakethe ye-HKOTC eHong Kong.