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Cage aquaculture was detrimental to the Guizhou water ecosystem because unregulated installation of net grids congested waterways and led to a phenomenon called eutrophication, which occurs when excess nutrients from residues of fish feed and excrement cause algae to bloom and block out sunlight below the water's surface.

California's vehicle emissions rules, more stringent than the Trump EPA's rules, are followed by a dozen other states that account for more than 40 percent of US vehicle sales.

CNPC produced 150.3 billion cubic meters of natural gas in 2019, with domestic production reaching 118.8 billion cubic meters-a year-on-year increase of 8.6 percent.

Canadian Chief Public Health Officer Theresa Tam said on Sunday that Canad will continue to see the rapid growth of new cases of COVID-19 if Canadians don't reduce their close contacts.

CHONGQING -- Police in Southwest China's Chongqing municipality have busted a 20-person gang for making and selling guns online, local police said Tuesday.