Nature: Around a third of the world’s yet-to-be discovered gas resources and 13% of its undiscovered oil reserves may lie north of the Arctic Circle, a detailed geological survey has concluded. The research, published in Science1, fills in details of preliminary mapping results announced last year by the US Geological Survey (USGS), in its Circum-Arctic Resource Appraisal. The estimates are based purely on geological data, and take no account of whether the oil and gas stores are …