Greenwire: The Bureau of Land Management yesterday delayed all oil and gas lease sales in Montana, North Dakota and South Dakota while the agency studies their potential impact on climate change. The next sale had been scheduled for April 13 and included about 91,000 acres. Sales had also been planned for June and August. BLM’s Montana office said it decided to delay those sales “in order to bring more certainty to industry and in light of expected litigation.” The decision comes in the …