Scientists have uncovered evidence indicating that humans extensively used fire to transform environments as early as 50,000 years ago -- far earlier than previously believed.

During the day on Wednesday, parts of Beijing, Tianjin, Hebei, Shandong, Inner Mongolia, Heilongjiang, Jilin, Liaoning, Xinjiang, Jiangxi, Fujian, Guangdong and Guangxi will experience scorching weather, with temperatures reaching over 35 degrees Celsius, according to the National Meteorological Center (NMC).

High temperatures ranging from 37 to 39 degrees Celsius are expected in some of the aforementioned regions -- with certain local areas even set to experience temperatures above 40 degrees Celsius, the NMC said.

The center suggested that people take protective measures to prevent excessive exposure to the sun.

China has a four-tier weather warning system, with red representing the most severe warning, followed by orange, yellow and blue.