https://www.khanacademy.org/science/biology/biodiversity-and-conservation/threats-to-biodiversity/v/ocean-acidification-and-biodiversity-impacts 2021-03-18T10:33:23Z Demystifying ocean acidification and biodiversity impacts Why rising carbon dioxide levels in the atmosphere affect the acidity of the ocean, and what the consequences are for marine life. Video by California Academy of Sciences. California Academy of Sciences video https://cdn.kastatic.org/googleusercontent/6YMU-CjQIlS4BSH5nuCYtNKXHOR56CiaBGW3M27MYwMNoI5KUIcZ6Z-jCcEWiFJCvaTHutY6sRF3BURNZGGGej4 Demystifying ocean acidification and biodiversity impacts Why rising carbon dioxide levels in the atmosphere affect the acidity of the ocean, and what the consequences are for marine life. Video by California Academy of Sciences. https://cdn.kastatic.org/ka-youtube-converted/GL7qJYKzcsk.mp4/GL7qJYKzcsk.mp4 733 Chemical reactions and their environmental impact https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:atmospheric-pollution/x0b0e430a38ebd23f:air-pollution/v/a-thermal-inversion-example-in-donora-ap-environmental-science-khan-academy 2025-08-08T21:39:42.49220884Z A thermal inversion example: the Donora smog During a thermal inversion, the normal temperature gradient in the atmosphere is altered as the air temperature at the Earth's surface is cooler than the air at higher altitudes. Thermal inversion traps pollution close to the ground, especially smog and particulates. The Donora death fog of 1948, a disastrous air pollution event in Pennsylvania, highlighted the lethal effects of trapped toxic emissions from industrial processes. This incident sparked the Clean Air Movement in the U.S., emphasizing the urgent need for air pollution control measures. Wieteke Holthuijzen video https://cdn.kastatic.org/ka_thumbnails_cache/084c6a8c-f0a9-4ffb-85d6-f9065b33eb07_1280_720_base.png A thermal inversion example: the Donora smog During a thermal inversion, the normal temperature gradient in the atmosphere is altered as the air temperature at the Earth's surface is cooler than the air at higher altitudes. Thermal inversion traps pollution close to the ground, especially smog and particulates. The Donora death fog of 1948, a disastrous air pollution event in Pennsylvania, highlighted the lethal effects of trapped toxic emissions from industrial processes. This incident sparked the Clean Air Movement in the U.S., emphasizing the urgent need for air pollution control measures. https://cdn.kastatic.org/ka-youtube-converted/OCMs3xNIquE.mp4/OCMs3xNIquE.mp4 114 Chemical reactions and their environmental impact https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:atmospheric-pollution/x0b0e430a38ebd23f:air-pollution/v/indoor-air-pollutants 2025-08-08T21:39:42.49220884Z Indoor air pollutants Indoor air pollutants can come from natural sources, human-made sources, and combustion. Common natural pollutants include radon, mold, and dust. Common human-made pollutants include Volatile Organic Compounds (VOCs) and formaldehyde. Common combustion pollutants include carbon monoxide, nitrogen oxides, sulfur dioxide, particulates, and tobacco smoke. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/a9bf0746-5acc-4969-b84a-457b79248224_1280_720_base.png Indoor air pollutants Indoor air pollutants can come from natural sources, human-made sources, and combustion. Common natural pollutants include radon, mold, and dust. Common human-made pollutants include Volatile Organic Compounds (VOCs) and formaldehyde. Common combustion pollutants include carbon monoxide, nitrogen oxides, sulfur dioxide, particulates, and tobacco smoke. https://cdn.kastatic.org/ka-youtube-converted/nqRPRwO79kg.mp4/nqRPRwO79kg.mp4 415 Chemical reactions and their environmental impact https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:aquatic-and-terrestrial-pollution/x0b0e430a38ebd23f:sources-of-pollution/v/human-impact-on-aquatic-environments 2024-06-21T23:15:14.703721694Z Human impact on aquatic environments Human activities cause significant stress to aquatic environments, leading to devastating effects on ecosystems. Warming ocean temperatures damage coral reefs, oil spills harm marine life, and nutrient pollution creates oceanic dead zones. Additionally, the introduction of toxic substances like mercury further threatens aquatic biodiversity. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/238f89e4-6b9a-4b3e-aeb5-1ae104cdfb17_1280_720_base.png Human impact on aquatic environments Human activities cause significant stress to aquatic environments, leading to devastating effects on ecosystems. Warming ocean temperatures damage coral reefs, oil spills harm marine life, and nutrient pollution creates oceanic dead zones. Additionally, the introduction of toxic substances like mercury further threatens aquatic biodiversity. https://cdn.kastatic.org/ka-youtube-converted/nZjMRq9tev8.mp4/nZjMRq9tev8.mp4 282 Chemical reactions and their environmental impact https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:atmospheric-pollution/x0b0e430a38ebd23f:other-atmospheric-pollution/v/acid-rain 2024-06-21T23:15:14.703721694Z Acid rain Acid rain, caused by pollution from burning fossil fuels, has harmful effects on the environment and human health. It forms when sulfur and nitrogen oxides interact with UV radiation and water molecules, creating corrosive sulfuric and nitric acid vapors. Acid rain damages buildings, contaminates water, acidifies soils, and harms forests. Despite reductions in emissions, it remains a global issue. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/d9f874cf-1450-41c3-87f7-273d42f816f3_1280_720_base.png Acid rain Acid rain, caused by pollution from burning fossil fuels, has harmful effects on the environment and human health. It forms when sulfur and nitrogen oxides interact with UV radiation and water molecules, creating corrosive sulfuric and nitric acid vapors. Acid rain damages buildings, contaminates water, acidifies soils, and harms forests. Despite reductions in emissions, it remains a global issue. https://cdn.kastatic.org/ka-youtube-converted/P4I-abHPa-I.mp4/P4I-abHPa-I.mp4 461 Chemical reactions and their environmental impact https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:aquatic-and-terrestrial-pollution/x0b0e430a38ebd23f:pollution-and-health/v/pollution-and-human-health 2024-06-21T23:15:14.703721694Z Pollution and human health Air pollution (via toxic gases, particulate matter, and chemicals) can lead to a range of health issues, including respiratory and cardiovascular illnesses. Linking specific pollutants to health issues via multiple routes of exposure is challenging, as shown by an example connecting asbestos and mesothelioma, a type of cancer. Environmental regulations are key to protecting public health. Wieteke Holthuijzen video https://cdn.kastatic.org/ka_thumbnails_cache/a6008da9-2931-489b-b2e9-f20116a56b71_1280_720_base.png Pollution and human health Air pollution (via toxic gases, particulate matter, and chemicals) can lead to a range of health issues, including respiratory and cardiovascular illnesses. Linking specific pollutants to health issues via multiple routes of exposure is challenging, as shown by an example connecting asbestos and mesothelioma, a type of cancer. Environmental regulations are key to protecting public health. https://cdn.kastatic.org/ka-youtube-converted/miaewHG2-X0.mp4/miaewHG2-X0.mp4 386 Chemical reactions and their environmental impact https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:atmospheric-pollution/x0b0e430a38ebd23f:air-pollution/a/photochemical-smog-and-ozone 2024-06-21T23:15:14.703721694Z Photochemical smog and ozone Photochemical smog is a mixture of tropospheric ozone and other air pollutants. Photochemical smog often forms in urban areas with high solar radiation. article https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:chemistry-of-the-environment/x8bc8fb44369617ed:air-quality-and-climate/e/greenhouse-effect-and-acid-rain 2025-02-13T13:42:33.753834602Z Greenhouse effect and Acid rain Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:atmospheric-pollution/x0b0e430a38ebd23f:air-pollution/e/air-pollution 2026-05-04T07:50:51.861128514Z Air pollution Apply your understanding of air pollution in this set of free practice questions aligned to AP standards. exercise