And secure domestic sources of energy are particularly prized at a time when prices are volatile and many of the big oil and gas exporters are becoming worryingly nationalistic.

• 而且，当世界能源价格剧烈波动，当许多大型的石油和天然气的出口国由于担忧而变得民族主义，保护国内能源已变得尤为重要。