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The percentage of students scoring a grade of "5" was only 7.0% in the 2021 testing administration. It remains one of the lowest "5" scoring AP Exams to this date right under AP Art History, AP English Literature & Composition, AP English Language & Composition, and AP World History. The AP Environmental Science exam was first administered in 1998.
AP Physics 1: Algebra-Based and AP Physics 2: Algebra-Based [63] Fluids, which used to be Unit 1 in AP Physics 2, became Unit 8 in AP Physics 1. With Fluids no longer being in its curriculum, the section of AP Physics 2 that covered Waves and Optics was split into two units that covered the topic with more depth.
In 2021, a summary of progress towards 16 climate mitigation strategies, expressed in terms of stabilization wedges, reported that while some areas have seen substantial progress (e.g. improving vehicle efficiency) others have seen little or negative progress (e.g. loss of tropical tree cover in Asia and Africa).
The term environmental services was introduced in a 1970 report of the Study of Critical Environmental Problems, [91] which listed services including insect pollination, fisheries, climate regulation and flood control. In following years, variations of the term were used, but eventually 'ecosystem services' became the standard in scientific ...
For a starting amount of 1 tonne of methane, which has a GWP of 25, after combustion there would be 2.74 tonnes of CO 2, each tonne of which has a GWP of 1. This is a net reduction of 22.26 tonnes of GWP, reducing the global warming effect by a ratio of 25:2.74 (approximately 9 times).
[1] A carbon sink is a natural or artificial carbon sequestration process that "removes a greenhouse gas , an aerosol or a precursor of a greenhouse gas from the atmosphere ". [ 2 ] : 2249 These sinks form an important part of the natural carbon cycle .
The existence of a global carrying capacity, limiting the amount of life that can live at once, is debated, as is the question of whether such a limit would also cap the number of species. While records of life in the sea show a logistic pattern of growth, life on land (insects, plants and tetrapods) shows an exponential rise in diversity. [ 10 ]
AMOC in relation to the global thermohaline circulation . The Atlantic meridional overturning circulation (AMOC) is the main current system in the Atlantic Ocean [1]: 2238 and is also part of the global thermohaline circulation, which connects the world's oceans with a single "conveyor belt" of continuous water exchange. [18]