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The concession was revised inbriefly suspended in —53, and renewed in in a consortium with other oil companies. Effective January 1,British Petroleum became a holding company. Beginning inthe British government reduced its ownership of British Petroleum by selling shares to the public, and in the late s the government turned over British Petroleum entirely to private ownership by selling its remaining shares. In merging with U. In the offshore drilling rig Deepwater Horizonowned bp history dating Transocean and leased by BP, exploded and collapsed, causing a rupture in the riser of a very deep oil well. An estimated 4. The company subsequently paid billions of dollars in damages to individuals and businesses affected by the spill. BP and its subsidiaries and associated companies continue to engage in the exploration, production, refining, transportation, and distribution of oil and natural gas and in the manufacture of chemicals, plastics, and synthetic fibres.
The initials BP or bp and rarely B. While BP is also used generally as an imprecise estimate of an age of an object or event, the use of it in science was made necessary by the quirks of the radiocarbon methodology. Radiocarbon dating was invented in the late 's, and within a few decades, it was discovered that while the dates retrieved from the method have a sound, repeatable progression, they are not a one-to-one match with calendar years. Most importantly, researchers discovered that radiocarbon dates are affected by the amount of carbon in the atmosphere, which has fluctuated greatly in the past for both natural and human-caused reasons such as the invention of iron smeltingthe Industrial Revolutionand the invention of the combustion bp history dating. Tree ringswhich keep a record of the amount of carbon in the atmosphere when they are created, are used to calibrate or fine-tune radiocarbon dates to their calendar dates.
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I suspect this is because scientists are not that comfortable with the origins of the calendar — i. So, really you would want to add to the BC year. Informally, you can use the year AD as your zero point. Take the current year and add it to the BC year. Or take the BC bp history dating and add to it. Or It depends on how you are using the system. There is however one complication: year 0 does not exist.
Before Present BP years is a time scale used mainly in archaeology , geology and other scientific disciplines to specify when events occurred in the past. Because the "present" time changes, standard practice is to use 1 January as the commencement date of the age scale, reflecting the origin of practical radiocarbon dating in the s. The abbreviation "BP" has alternatively been interpreted as "Before Physics";  that is, before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, making dating after that time likely to be unreliable. In a convention that is not always observed, many sources restrict the use of BP dates to those produced with radiocarbon dating.