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San Francisco firefighters battle a fire on Geary Boulevard in San Francisco, Wednesday, Feb. 6, 2019. A gas explosion in a San Francisco neighborhood shot flames high into the air Wednesday and was burning several buildings as utility crews scrambled to shut off the flow of gas. Construction workers cut a natural gas line, San Francisco Fire Chief Joanne Hayes-White said. (AP Photo/Jeff Chiu)

In this Wednesday, Dec. 19, 2018 photo attorney Brian Blatz sits on the roof deck at his office in Los Angeles. When California broadly legalized marijuana on Jan. 1, Blatz with a background in banking and health care had been working for a year to set up a trucking firm . On its website, Long Beach, California-based Verdant Distribution made clear its ambition: to be the nation's pre-eminent business for transporting cannabis. But the choppy rollout of California's legal market saddled the company with costly delays, and it was undone in the end by an abrupt state rule change that allowed just about any marijuana business to become its own distributor, undercutting the need for stand-alone companies like Verdant to do the job. (AP Photo/Richard Vogel)

Protesters on canoes display placard as construction workers dumped a truckload of sediment on the ground and bulldozed it into the sea at Henoko on Okinawa’s east coast to build a runway for a Marine Corps base, Friday, Dec. 14, 2018. Japan's central government started main reclamation work Friday at a disputed U.S. military base relocation site on the southern island of Okinawa despite fierce local opposition. (Koji Harada/Kyodo News via AP)

FILE- In this Sept. 19, 2018, file photo a tractor operator picks potatoes at Brett Jensen Farms outside of Idaho Falls, Idaho. On Tuesday, Dec. 12, the Labor Department reports on U.S. producer price inflation in November. (John Roark/The Idaho Post-Register via AP, File)

FILE- In this Dec. 14, 2017, file photo, boxes for sorted mail are stacked at the main post office in Omaha, Neb. A task force created by President Donald Trump to evaluate ways to stem billions of dollars in losses at the U.S. Postal Service is suggesting a range of options, including proposals that could significantly boost the cost of sending non-essential mail. The report recommended that the Postal Service develop a new pricing model that would remove current price caps and charge market-based prices for both mail and packages that were not deemed to be “essential postal services.”. (AP Photo/Nati Harnik, File)

The external view of the post office in Pieve Modolena, near Reggio Emilia, Italy, where Francesco Amato, days after receiving a 19-year jail term for a Mafia conviction, took 5 employees hostage wielding a knife, Monday, Nov. 5, 2018. The man later freed the hostages and was arrested by police. (Elisabetta Baracchi/ANSA via AP)

Protesters on boats oppose as workers of Japan's central government resumed work at a disputed U.S. military base relocation site on the southern island of Okinawa, at Henoko in Nago city, Okinawa prefecture, Japan, Thursday, Nov. 1, 2018. The Defense Ministry's local branch said an early stage of landfill work at Henoko on Okinawa's east coast began Thursday morning.(Koji Harada/Kyodo News via AP)

In this Tuesday, Oct. 30, 2018, photo, delivery workers sort boxes of goods for their customers outside the capital city development academy in Beijing. An official measure of China's manufacturing activity fell to a two-year low in October, adding to pressure on Beijing to shore up economic growth amid a tariff war with Washington. The monthly purchasing managers' index issued Tuesday by the National Bureau of Statistics and an industry group, the China of Logistics and Purchasing, fell to 50.2 from September's 50.8 on a 100-point scale. (AP Photo/Andy Wong)