Exxon has long led the oil majors in investment in research and technology, keeping up such work even when the oil price collapse of the late 1990s led rivals to slash funding.
It was a desire to keep the oil cartel's market power in check during the oil-price shocks of the 1970s that led western oil companies, denied access to the bounties of the Gulf, to begin extracting oil from the North Sea, Alaska, the Gulf of Mexico and elsewhere.
Chavez, though cancer-stricken in recent years, had led the oil-rich Latin American nation for years by espousing a fiery brand of socialism.
Kuwait has backed plans to increase oil production up from April, easing the global oil shortage that has led to spiralling oil prices.
Chavez, though cancer-stricken in recent years, had led the oil-rich Latin American nation for nearly 14 years while espousing a fiery brand of socialism and bickering with a succession of U.S. governments over what he called Washington's hegemony in the region.
The urgency of the BP disaster in the Gulf of Mexico led the Oil Cleanup Challenge to focus on mechanical cleanup technologies rather than absorbents (such as the recycled surfboard waste I wrote about in the current issue of Forbes) or chemical dispersants.
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Economic development in the oil-rich country was led by the US oil majors.
Prices extended losses in afternoon trading as the raw commodity sector took another beating Wednesday, led by crude oil.
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Gold and silver, led by crude oil, will spike if talks between the US and UK for joint military action in Libya take root.
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Further south down the Atlantic coast, Angola is another country whose oil has led to a deepening American involvement.
Anadarko has a 25% stake in the failed Macondo well that led to the Gulf oil spill during April 2010.
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Long-dominant incandescent technology started to change in the 1970s when higher oil prices led businesses to think more about energy efficiency.
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The commodity is usually bought as a hedge against oil-led inflation.
Tensions over Tehran's alleged attempts to develop nuclear weapons have led to Iran halting oil exports to the UK and France in retaliation for European Union sanctions.
Shale gas and oil has led to an explosion of onshore activity in the U.S. and around the world as producer use new technologies to tap resources at an economical cost.
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The volatility in the value of the dollar has led to volatility in the oil market.
When gas prices finally did fall, it was mostly because the global recession had led to less demand for oil.
And I think sometimes the pictures have led people to believe that oil may be where they were planning on vacationing.
It doesn't help that the U.S. State Department opposes Kurdish oil deals as too much too soon, while the Iraqi oil ministry, led by Shiite Husayn al-Shahristani, condemns any deals as illegal.
Rising demand for energy, the construction of new facilities and physical and cyber threats to these installations have led to growth in the oil and gas infrastructure security market, the report said.
But the Asian producers started making more SUVs and pickup trucks in their North American factories to escape the duties, and then a rising oil-price led many motorists to abandon these often gas-guzzling vehicles.
Ironically, given its far greater effort to tackle climate change, the European Union has seen its emissions rise, partly because its higher gas prices (linked to oil) have led to an increase in coal-fired power generation.
The great upthrust of the immigrant working class into the middle class after World War II, via the GI Bill, was stopped stone cold by the events of the autumn of 1973, when the October war in the Middle East led to the quadrupling of oil prices virtually overnight and the great inflation set in.
That incident led to the largest-ever oil spill in U.S. waters and the loss of 11 lives.
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Ten oil companies--led by BP (nyse: BP - news - people )with a 34% stake and Unocal with 10.3%--are jointly developing major fields there.
Severe external pressures, such the eurozone debt crisis, weak US growth and rising oil prices, had led to a "dramatic change" in the international situation in the past six months, he acknowledged.
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