"This is the world of the vicious circle: when the economy gets better, demand for oil goes up and oil prices
spike. This causes the economy to tank, which sends demand for oil down. Rinse and repeat. Add to that the effect of external events on oil prices (the Arab Spring, pipeline breakdowns, embargoes on Iran, etc. etc.
) and world economic growth is likely to remain both sluggish and unstable for the foreseeable future, held hostage to OPEC oil production until we get serious about alternative energy. And since, in this brave new world, the price of oil gyrates frequently and erratically, it's hard to get people serious about this. If oil were, say, permanently above $200 per barrel or so, we'd be building wind farms and installing PV solar at breakneck speed."