Associated Press-BISMARCK, N.D. (AP) — Donald Trump assigned Doug Burgum a singular mission in nominating the governor of oil-rich North Dakota to lead an agency that oversees a half-billion acres of federal land and vast areas offshore: “Drill baby drill.” That dictate from the president-elect’s announcement of Burgum for Secretary of Interior sets the stage for a reignition of the court battles over public lands and waters that helped define Trump’s first term, with environmentalists worried about climate change already pledging their opposition. Burgum is an ultra-wealthy software industry entrepreneur who grew up on his family’s farm. He represents a tame choice compared to other Trump Cabinet picks. Public lands experts said his experience as a popular two-term governor who aligns himself with conservationist Teddy Roosevelt suggests a willingness to…