Why are U.S. oil prices high, and any relief in sight?

Energy costs have been one of the main drivers of what’s become the highest inflation in a generation. In recent days, the price of a barrel of U.S. benchmark crude oil hit a seven-year high — US$87 a barrel, a dizzying jump of about 36 per cent since Dec. 1. Here’s a look at why the price is so high.
Source: ctv business
Why are U.S. oil prices high, and any relief in sight?