In this Dec. 18, 2020 file photo, pipes to be used for the Keystone XL pipeline are stored in a field near Dorchester, Neb. Experts say President Joe Biden's pledge to undo his predecessor's anti-regulatory policies on the environment won't be accomplished easily, despite a fast start. After taking office, Biden returned the U.S. to the Paris climate accords, revoked the Keystone oil pipeline’s federal permit and halted oil and gas leasing in the Arctic National Wildlife Refuge. (Chris Machian/Omaha World-Herald via AP) ** FILE **
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