The geology of China (or the geological structure of the People's Republic of China) consists of three Precambrian cratons surrounded by a number of orogenic belts. The modern tectonic environment is dominated by the continued collision of India with the rest of Asia starting 40–50 million years ago. This has formed the Himalayas and continues to deform most of China.^[2] China has vast mineral reserves,^[3] a significant earthquake risk in its western regions and rare isolated active volcanoes throughout the country.^[4]

Many geological concepts were discovered very early in China's history. However, it was not until the adoption of European natural science in the late 19th century that geology became a science in China.^[5]

China's vast and diverse landscape is home to a profound variety and abundance of wildlife. As of one of 17 megadiverse countries in the world,^[6] China has, according to one measure, 7,516 species of vertebrates including 4,936 fish, 1,269 bird, 562 mammal, 403 reptile and 346 amphibian species.^[7] In terms of the number of species, China ranks third in the world in mammals,^[8] eighth in birds,^[9] seventh in reptiles^[10] and seventh in amphibians.^[11]

Many species of animals are endemic to China, including the country's most famous wildlife species, the giant panda. In all, about one-sixth of mammal species and two-thirds of amphibian species in China are endemic to the country.^[8][11]

Wildlife in China share habitat with and bear acute pressure from the world's largest population of humans. At least 840 species are threatened, vulnerable or in danger of local extinction in China, due mainly to human activity such as habitat destruction, pollution and poaching for food, fur and ingredients for traditional Chinese medicine.^[12] Endangered wildlife is protected by law, and as of 2005, the country has over 2,349 nature reserves, covering a total area of 149.95 million hectares (578,960 square miles), about 15 percent of China's total land area.^[13]

The flora of China consists of a diverse range of plant species including over 39,000 vascular plants, 27,000 species of fungi and 3000 species of bryophytes.^[14][15][16] More than 30,000 plant species are native to China, representing nearly one-eighth of the world's total plant species, including thousands found nowhere else on Earth. China's land, extending over 9.6 million km, contains a variety of ecosystems and climates for plants to grow in. Some of the main climates include shores, tropical and subtropical forests, deserts, elevated plateaus and mountains. The events of the continental drift and early Paleozoic Caledonian movement also play a part in creating climatic and geographical diversity resulting in high levels of endemic vascular flora.^[17] These landscapes provide different ecosystems and climates for plants to grow in, creating a wide variety of different flora spanning over not just China, but different parts of the world.^[18]

Owing to tremendous differences in latitude, longitude, and altitude, the climate of China is extremely diverse, ranging from tropical in the far south to subarctic in the far north and alpine in the higher elevations of the Tibetan Plateau. Monsoon winds, caused by differences in the heat-absorbing capacity of the continent and the ocean, dominate the climate. During the summer, the East Asian Monsoon carries warm and moist air from the south and delivers the vast majority of the annual precipitation in much of the country. Conversely, the Siberian anticyclone dominates during winter, bringing cold and comparatively dry conditions. The advance and retreat of the monsoons account in large degree for the timing of the rainy season throughout the country. Although most of the country lies in the temperate belt, its climatic patterns are complex.

The northern extremities of both Heilongjiang and Inner Mongolia have a subarctic climate; in contrast, most of Hainan Island and parts of the extreme southern fringes of Yunnan have a tropical climate. Temperature differences in winter are considerable, but in summer the variance is considerably less. For example, Mohe County, Heilongjiang has a 24-hour average temperature in January approaching −30 °C (−22 °F), while the corresponding figure in July exceeds 18 °C (64 °F). By contrast, most of Hainan has a January mean in excess of 17 °C (63 °F), while the July mean there is generally above 28 °C (82 °F).

Precipitation is almost invariably concentrated in the warmer months, though annual totals range from less than 20 millimetres (0.8 in) in northwestern Qinghai and the Turpan Depression of Xinjiang to easily exceeding 2,000 millimetres (79 in) in Guangdong, Guangxi, and Hainan. Only in some pockets of the Dzungaria region of Xinjiang is the conspicuous seasonal variation in precipitation that defines Chinese (and, to a large extent, East Asian) climate absent.

Annual sunshine duration ranges from less than 1,100 hours in parts of Sichuan and Chongqing to over 3,400 hours in northwestern Qinghai. Seasonal patterns in sunshine vary considerably by region, but overall, the north and the Tibetan Plateau are sunnier than the south of the country.

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  The average annual precipitation in China and Taiwan
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  Early-season snow covering part of the North China Plain near Shijiazhuang, Hebei
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  Snow encircling the area around the Bo Hai
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  The first day of spring 2010 brought a massive sandstorm blowing from Inner Mongolia
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  On November 11, 2010, a wall of sand blew across northern China, covering much of the North China Plain and Shandong Peninsula.
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  Smog from Eastern China spread over neighboring areas in February 2004.
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  Haze over the North China Plain and the Lüliang Mountains of Shanxi
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  Natural color satellite image of a smog event in the heart of northern China
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  Dense smog settled over the North China Plain on February 20, 2011.

Climate change is having major effects on the Chinese economy, society and the environment.^[19][20] China is the largest emitter of carbon dioxide, through an energy infrastructure heavily focused on coal. Other industries, such as a burgeoning construction industry and industrial manufacturing, contribute heavily to carbon emissions. However, like other developing countries, on a per-capita basis, China's carbon emissions are considerably less than countries like the United States.^[21] It has also been noted that higher-income countries have outsourced emissions-intensive industries to China.^[22][23] On the basis of cumulative CO₂ emissions measured from 1751 through to 2017, China is responsible for 13% globally and about half of the United States' cumulative emissions.^[24][25] China is now the world's largest polluter and in 2023 recorded it's hottest year on record with an average temperature of 10.7 C.^[26]

China is suffering from the negative effects of global warming in agriculture, forestry and water resources, and is expected to continue to see increased impacts. China's government is taking some measures to increase renewable energy, and other decarbonization efforts, vowing to hit peak emissions before 2030 and be carbon neutral by 2060 by adopting "more vigorous policies and measures."^[27] The GHG emissions of China will probably peak in 2025, and by 2030 they will return to 2022 levels. However, such pathway still leads to 3 degree temperature rise.^[28]

This is a list of the nationally designated protected areas of China. There are many forms of protected areas in China. Based on their relative importance, each type of protected area can be further graded into two to three levels (national, provincial and prefectural/county level). Nevertheless, the highest rank for "pocket nature preserve" (social and mass-based), "no-hunting area", "no-fishing area", "no-logging area", "wild medicinal material resources conservation area", "crop germplasm resources conservation area", "forest tree germplasm resources conservation area" or "source water protection area" is practically restricted to provincial level. The local government at county level is also responsible for the delimitation and declaration of "basic farmland protection area" and "basic grassland".

Take note that many protected areas in China have multiple official designations, and the statutory boundaries of these multi-designated PAs may be identical or may vary one from the other. For instance, the boundaries of Huangshan NSHA coincide with those of the Huangshan NGP, whereas Fujian province's Wuyi Mountains NNR, NSHA and NFP are adjacent to each other. In Heilongjiang, 27,642.14 hectares out of 115,340.27 hectares of Huzhong NFP are intersected with the experiment zone of Huzhong NNR.