Oil is nearly $100 a barrel. Gas may soon reach $4 a gallon. And Americans are being bitten in almost every way imaginable by this insidious oil hydra.

Two billion people in China and India are now eager consumers. They want the cars, gadgets, and lifestyle that Westerners have claimed as a birthright for a half-century. Their growing energy appetites mean that the international petroleum market may remain tight, even if Americans — who use almost twice as much oil per day as China and India put together — cut back on imported energy.

The Middle East is raking in billions each week. At best, our so-called friends in cash-laden Saudi Arabia subsidize fundamentalist mosques and hate-filled madrassas worldwide. At worst, our enemies in petrol-rich Iran are after the bomb, send weapons into Iraq to kill Americans and fund Hezbollah jihadists.

War in Iraq, rumors of fighting in the near-future in Iran and tension on the West Bank only panic markets, raise oil prices and further enrich our grinning enemies.

The nearly half-trillion dollars we will soon pay for imported oil does a lot more than prop up Russia’s Vladimir Putin, Venezuela’s Hugo Chavez and Iran’s Mahmoud Ahmadinejad. The petrodollar drain also contributes to our trade deficits, falling dollar and a general demoralization of the American people.

Our oil habit not only makes us dependent on some creepy suppliers, but we look like fools as we work nonstop to hand over our earnings to those who are rich by an accident of sitting atop oil someone else found and developed.

There is talk in this country of a gradual transition to alternative fuels, solar power, wind machines, plug-in electric cars, and nuclear power. Supposedly Americans will soon be less dependent on imported oil — while helping to slow global warming — as we are weaned off our fossil-fuel addiction.

But let’s talk about the present: If oil continues to climb, ultimately, it will change our very way of life. Hard-pressed families will shell out thousands more a year in direct transportation and heating and cooling costs, and more still as consumer prices inflate.

It may have always been unwise for commuters to buy large SUVs and V8 supercab trucks. Now, though, we may reach the point where these pricey huge vehicles will sputter to a halt. Indebted Americans will still shell out monthly payments to pay off their parked dinosaurs, only to drive them for emergency or ceremonial occasions.