> It has gone from being a major producer of oil and gas to being heavily dependent on imports.
You seem to be suggesting this happened for reasons other than extracting and selling all the oil and gas that was there, while also stalling on any domestic moves to burn less fuel, leading to the obvious imbalance.
Even the oil industry when they show graphs of what they describe as "unrealistic" options which involve massive cuts in taxation are only tiny speed bumps on the way to exhausting the reserves.
Meanwhile a single round of wind turbine auctions will save far more gas than that. And be a "green transition".