Morgan Stanley analysts recently included this chart of crude production costs. Onshore Middle East oil sites are much cheaper to tap than North American shale, which costs about $65 per barrel to extract.
1. ponder-reflect deeply on a subject; I mulled over the events of the afternoon; philosophers have speculated on the question of God for thousands of years; The scientist must stop to observe and start to excogitate.
Synonyms: better; educate; over-refine; civilise; amend; fine-tune; school; civilize; down; train; ameliorate; polish; cultivate; overrefine; meliorate; improve; Antonyms: worsen