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Different regions of California have very different climates, depending on their latitude, elevation, and proximity to the coast. Most of the state has a Mediterranean climate, with rainy winters and dry summers. The influence of the ocean generally moderates temperature extremes, creating cooler summers and warmer winters, and the cold oceanic California Current offshore often creates summer fog near the coast. As one moves away from the coast, the climate becomes more continental, with hotter summers and colder winters. Westerly winds from the ocean also bring moisture, and the northern parts of the state generally receive higher rainfall than the south. California's mountain ranges influence the climate as well; moisture-laden air from the west cools as it ascends the mountains, dropping moisture; some of the rainiest parts of the state are west-facing mountain slopes. Northwestern California has a temperate climate with rainfall of 15-40 inches (38-102 cm) per year. The Central Valley has a Mediterranean climate, but with greater temperature extremes than the coastal areas. The high mountains, including the Sierra Nevada, have a mountain climate with snow in winter and moderate heat in summer.
On the east side of the mountains is a drier " rain shadow." California's desert climate regions lie east of the high Sierra Nevada and southern California's Transverse Ranges and Peninsular Ranges. The low deserts east of the southern California mountains, including the Imperial and Coachella valleys and the lower Colorado River, are part of the Sonoran Desert, with hot summers and mild winters; the higher elevation deserts of eastern California, including the Mojave Desert, Owens Valley, and the Modoc Plateau , are part of the Great Basin region, with hot summers and cold winters.
Ecologically, California is one of the richest and most diverse parts of the world, and includes some of the most endangered ecological communities. California's diverse geography, geology, soils and climate have generated a tremendous diversity of plant and animal life. The state of California is part of the Nearctic ecozone, and spans a number of terrestrial ecoregions, and is perhaps the most ecologically diverse state in the United States.
California has a high percentage of endemic species. California endemics include relict species that have died out elsewhere, including the redwoods and the Catalina Ironwood (Lyonothamnus floribundus). Many other endemics originated through differentiation or adaptive radiation, whereby multiple species develop from a common ancestor to take advantage of diverse ecological conditions. California's great abundance of species of California lilac ( Ceanothus) is an example of adaptive radiation. Many California endemics have become endangered, as urbanization, logging, overgrazing, and the introduction of exotic species have encroached on their habitat.
California is responsible for 14% of American gross domestic product, which at nearly $1.4 trillion is greater than that of every country in the world save for the United States, China, Japan, India, Germany, France and the United Kingdom.
The predominant industry, more than twice as large as the next largest, is agriculture, (including fruit, vegetables, dairy, and wine). This is followed by aerospace; entertainment, primarily television by dollar volume, although many movies are still made in California; and light manufacturing including computer hardware and software, and the mining of borax.
Per capita income varies widely by geographic region and profession. The Central Valley has the most extreme contrasts of income, with migrant farm workers making less than minimum wage, contrasted with farmers who frequently manage multimillion-dollar farms. Most farm managers are highly educated, most with at least master's degrees. While cities include some of the wealthiest per-capita areas in the U.S., notably Irvine in Orange County, the non-agricultural central counties have some of the highest poverty rates in the U.S. The high-technology sectors in Orange County and Silicon Valley, in Santa Clara County are currently in a recession because of the dot.com bust, but biotechnology, video games and animation are taking up the slack.
See also: California unemployment statistics
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