"Why exactly should fossile fuels cost more pro rata than now or in the past?"
Easy, it's the law of supply and demand. With emerging countries like India and China having an ever-increasing thirst for oil, the world market will supply to whoever is willing to pay the most. Don't forget that road traffic competes with the chemical and power industries for the oil that's on the market. In addition, the governments of nearly all developed countries have adopted long-term policies of directing the economy away from fossil fuels and towards renewable energy sources. Whether this is for ecological reasons or just to to extend the availability of oil for longer, the most powerful tool they have at their disposal are taxes.
Easy, it's the law of supply and demand. With emerging countries like India and China having an ever-increasing thirst for oil, the world market will supply to whoever is willing to pay the most. Don't forget that road traffic competes with the chemical and power industries for the oil that's on the market. In addition, the governments of nearly all developed countries have adopted long-term policies of directing the economy away from fossil fuels and towards renewable energy sources. Whether this is for ecological reasons or just to to extend the availability of oil for longer, the most powerful tool they have at their disposal are taxes.