Sarnia vs Shenzhen City

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Sarnia is a city in Southwestern Ontario, Canada, with a 2016 population of 71,594. It is the largest city on Lake Huron and in Lambton County. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes where Lake Huron flows into the St. Clair River, which forms the Canada–United States border, directly across from Port Huron, Michigan. The site's natural harbour first attracted the French explorer La Salle. He named the site "The Rapids" on 23 August 1679, when he had horses and men pull his 45-ton barque Le Griffon north against the nearly four-knot current of the St. Clair River.This was the first time that a vessel other than a canoe or other oar-powered vessel had sailed into Lake Huron, and La Salle's voyage was germinal in the development of commercial shipping on the Great Lakes. Located in the natural harbour, the Sarnia port remains an important centre for lake freighters and oceangoing ships carrying cargoes of grain and petroleum products. The natural port and the salt caverns that exist in the surrounding areas, together with the oil discovered in nearby Oil Springs in 1858, led to the dramatic growth of the petroleum industry in this area.

Because Oil Springs was the first place in Canada and North America to drill commercially for oil, the knowledge that was acquired there resulted in oil drillers from Sarnia travelling the world teaching other enterprises and nations how to drill for oil.The complex of refining and chemical companies is called Chemical Valley and located south of downtown Sarnia. In 2011 the city had the highest level of particulates air pollution of any Canadian city, but it has since dropped to rank 30th in this hazard. About 60 percent of the particulate matter comes from industries and polluters in the neighbouring United States.Lake Huron is cooler than the air in summer and warmer than the air in winter; therefore, it moderates Sarnia's humid continental climate, making temperature extremes of hot and cold less evident. In the winter, Sarnia occasionally experiences lake-effect snow from Arctic air blowing across the warmer waters of Lake Huron and condensing to form snow squalls over land.

Source: Wikipedia

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Shenzhen (; Chinese: 深圳; Mandarin pronunciation: [ʂə́n.ʈʂə̂n] (listen)) is a major sub-provincial city on the east bank of the Pearl River estuary on the central coast of southern Guangdong province, People's Republic of China. It forms part of the Pearl River Delta megalopolis, bordering Hong Kong to the south, Huizhou to the northeast and Dongguan to the northwest, and shares maritime boundaries with Guangzhou, Zhongshan and Zhuhai to the west and southwest across the estuary. Shenzhen's cityscape results from its vibrant economy—made possible by rapid foreign direct investment (FDI) following the institution of the policy of "reform and opening-up" in 1979. The city is a leading global technology hub, dubbed by media China's Silicon Valley. It was one of the fastest-growing cities in the world in the 1990s and the 2000s, and has been ranked second on the list "top 10 cities to visit in 2019" by Lonely Planet. Shenzhen is ranked as an Alpha- (global first tier) city together with Guangzhou (China), Melbourne (Australia) and San Francisco (the U.S).Shenzhen, which roughly follows the administrative boundaries of Bao'an County, officially became a city in 1979, taking its name from the former county town, whose train station was the last stop on the Mainland Chinese section of the railway between Canton and Kowloon. In 1980, Shenzhen was established as China's first special economic zone.

Shenzhen's registered population as of 2017 was estimated at 12,905,000, but local police and authorities estimate the population at about 20 million, due to large populations of short-term residents, unregistered floating migrants, part-time residents, commuters, visitors, as well as other temporary residents.Shenzhen hosts the Shenzhen Stock Exchange as well as the headquarters of numerous multinational companies such as JXD, Vanke, Hytera, CIMC, SF Express, Shenzhen Airlines, Nepstar, Hasee, Ping An Bank, Ping An Insurance, China Merchants Bank, Evergrande Group, Tencent, ZTE, OnePlus, Huawei, DJI and BYD. In the 2020 Global Financial Centres Index, Shenzhen was ranked as having the 9th most competitive financial center in the world (between San Francisco and Zürich) and 6th most competitive in Asia (after Shanghai, Tokyo, Hong Kong, Singapore and Beijing). It has the third busiest container port in the world. According to the Hurun Global Rich List 2020, Shenzhen is the world’s 5th largest billionaires city (after Beijing, New York City, Shanghai and Hong Kong).Shenzhen is an international hub of research and innovation in China and ranks 32nd among the world's top 200 science cities by scientific research as tracked by the Nature Index. The city is home to several notable institutes, such as Shenzhen University and Southern University of Science and Technology.

Source: Wikipedia