On the U.S. Interstate Highway System, in most states exits are numbered based on the nearest milepost from the highway's western or southern terminus within that state. Several that are less than half a mile (800 m) from state boundaries in that direction are numbered as Exit 0. This implies that the goal of net-zero for CO2 is now enshrined as a key goal (at least for the 1.5ºC aspiration). However, it is the timetable and cumulative emissions up until ‘net zero’ that will determine the eventual temperatures (with some additional influence from cuts to other GHGs and short-lived forcings). So even though ‘net-zero’ is only coupled to the 1.5ºC aspiration in this text, it’s actually much a broader concept. In telephony, pressing 0 is often used for dialling out of a company network or to a different city or region, and 00 is used for dialling abroad. In some countries, dialling 0 places a call for operator assistance.

Brezina, Corona (2006). Al-Khwarizmi: The Inventor of Algebra. The Rosen Publishing Group. ISBN 978-1-4042-0513-0. Archived from the original on 29 February 2020 . Retrieved 26 September 2016.Quipu, a knotted cord device, used in the Inca Empire and its predecessor societies in the Andean region to record accounting and other digital data, is encoded in a base ten positional system. Zero is represented by the absence of a knot in the appropriate position. As a value or a number, zero is not the same as the digit zero, used in numeral systems with positional notation. Successive positions of digits have higher weights, so the digit zero is used inside a numeral to skip a position and give appropriate weights to the preceding and following digits. A zero digit is not always necessary in a positional number system (e.g., the number 02). In some instances, a leading zero may be used to distinguish a number.

A stone tablet found in the ruins of a temple near Sambor on the Mekong, Kratié Province, Cambodia, includes the inscription of "605" in Khmer numerals (a set of numeral glyphs for the Hindu–Arabic numeral system). The number is the year of the inscription in the Saka era, corresponding to a date of AD 683. [49] There are numerous copper plate inscriptions, with the same small o in them, some of them possibly dated to the 6th century, but their date or authenticity may be open to doubt. [8] The Lokavibhāga, a Jain text on cosmology surviving in a medieval Sanskrit translation of the Prakrit original, which is internally dated to AD 458 ( Saka era 380), uses a decimal place-value system, including a zero. In this text, śūnya ("void, empty") is also used to refer to zero. [42] Even if this were to work – which is highly uncertain – the large-scale deployment of BECCS would risk pushing us beyond other planetary boundaries including freshwater use and soil health. Estimates of the amount of land required are as high as 3000 million hectares – twice the total amount of land currently under cultivation globally. You can find out more in this briefing from Friends of the Earth International (PDF). SSP1-1.9 (the scenario that achieves a 50% chance of keeping global temperature increase below +1.5ºC) required 200Gt(C) net negative anthropogenic emissions, that being 730Gt(CO2), roughly half through the period 2050-2100 and the remaining half through 2100-50. An in addition to that net requirement is the sequestering of enough CO2 to balance any “above scenario” emissions to achieve the projected net emissions, positive pre-2050 and and negative post-2050. See Fig2c from Meinshausen et al (2020).

Common names for the number 0 in English include zero, nought, naught ( / n ɔː t/), and nil. In contexts where at least one adjacent digit distinguishes it from the letter O, the number is sometimes pronounced as oh or o ( / oʊ/). Informal or slang terms for 0 include zilch and zip. Historically, ought, aught ( / ɔː t/), and cipher have also been used. The number 0 is the smallest nonnegative integer. The natural number following 0 is 1 and no natural number precedes 0. The number 0 may or may not be considered a natural number, [59] [60] but it is an integer, and hence a rational number and a real number. [61] All rational numbers are algebraic numbers, including 0. When the real numbers are extended to form the complex numbers, 0 becomes the origin of the complex plane. Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference

a b Hodgkin, Luke (2005). A History of Mathematics: From Mesopotamia to Modernity: From Mesopotamia to Modernity. Oxford University Press. p. 85. ISBN 978-0-19-152383-0. O'Connor, J.J. (January 2004). "Chinese numerals". Mac Tutor. School of Mathematics and Statistics University of St Andrews, Scotland. Archived from the original on 14 June 2020 . Retrieved 14 June 2020. My answer is no. Net-zero is a well-founded physical goal that is rooted in the science that climate deniers >mostly try to ignore. Is the rhetorical flourish here useful? I don’t particularly think so – it mostly serves to >confuse greenwashing (a real problem) with the science of the carbon cycle which people already have a >hard enough time with.”

A commitment for change

Companies with 'net zero' targets include Shell, BP and Rolls-Royce. This shows that big polluters now know they have to be seen to be serious about climate – but they're not making any noticeable shift away from their high-carbon core activities. It was a bizarre experience. I introduced myself to the other delegates saying I was an artist who had become alarmed as I realized I was living in a dying civilization. Even simpler land-based approaches such as tree planting need to be approached with caution. Where do corporations and rich countries plan to plant all these trees? Will it be on lands used for food growing by some of the poorest people in the world? Will they be monoculture plantations replacing diverse habitat? The Aryabhatiya (c.500), states sthānāt sthānaṁ daśaguṇaṁ syāt "from place to place each is ten times the preceding". [43] [44] [45] From the 13th century, manuals on calculation (adding, multiplying, extracting roots, etc.) became common in Europe where they were called algorismus after the Persian mathematician al-Khwārizmī. The most popular was written by Johannes de Sacrobosco, about 1235 and was one of the earliest scientific books to be printed in 1488. Until the late 15th century, Hindu–Arabic numerals seem to have predominated among mathematicians, while merchants preferred to use the Roman numerals. In the 16th century, they became commonly used in Europe.