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In 2022, about 20% of the Amazon rainforest has already been deforested and a further 6% was "highly degraded". [65] Research suggests that upon reaching about 20–25% (hence 0–5% more), the tipping point to flip it into a non-forest ecosystem – degraded savannah – (in eastern, southern and central Amazonia) will be reached.
Dell Inc. is an American technology company that develops, sells, repairs, and supports computers and related products and services. Dell is owned by its parent company, Dell Technologies. [ 3][ 4] Dell sells personal computers (PCs), servers, data storage devices, network switches, software, computer peripherals, HDTVs, cameras, printers, and ...
The National Institute for Space Research (INPE) in Brazil estimated that at least 7,747 km 2 (2,991 sq mi) of the Brazilian Amazon rainforest were cleared during the first half of 2019. [64] INPE subsequently reported that deforestation in the Brazilian Amazon reached a 12-year high between August 2019 and July 2020.
Stone Age. The Stone Age was a broad prehistoric period during which stone was widely used to make stone tools with an edge, a point, or a percussion surface. The period lasted for roughly 3.4 million years [1] and ended between 4,000 BC and 2,000 BC, with the advent of metalworking. [2] It therefore represents nearly 99.3% of human history.
White House. Design date. 2003. The United States twenty-dollar bill (US$20) is a denomination of U.S. currency. A portrait of Andrew Jackson, the seventh U.S. president (1829–1837), has been featured on the obverse of the bill since 1928; the White House is featured on the reverse. As of December 2018, the average life of a $20 bill in ...
The group primarily invests in companies operating in technology that offer goods and services to customers in a multitude of markets and industries ranging from the internet to automation. [ 4] With over $100 billion in capital at its onset, SoftBank's Vision Fund is the world's largest technology-focused venture capital fund.
Solar-cell efficiency is the portion of energy in the form of sunlight that can be converted via photovoltaics into electricity by the solar cell . The efficiency of the solar cells used in a photovoltaic system, in combination with latitude and climate, determines the annual energy output of the system. For example, a solar panel with 20% ...
A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.
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