https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:global-change/x0b0e430a38ebd23f:greenhouse-effect/v/greenhouse-effect-and-greenhouse-gases 2024-06-28T21:00:15.59562973Z Greenhouse effect and greenhouse gases The greenhouse effect, driven by gases like carbon dioxide, methane, and water vapor, is essential for maintaining Earth's habitable temperatures. However, excessive concentrations of these gases—particularly due to human activities—can lead to global warming and climate change. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/27e417aa-bb45-422d-bb99-7e0e28da1250_1280_720_base.png Greenhouse effect and greenhouse gases The greenhouse effect, driven by gases like carbon dioxide, methane, and water vapor, is essential for maintaining Earth's habitable temperatures. However, excessive concentrations of these gases—particularly due to human activities—can lead to global warming and climate change. https://cdn.kastatic.org/ka-youtube-converted/YpfxiDktSoI.mp4/YpfxiDktSoI.mp4 419 Greenhouse effect, global warming and their impact on climate https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electromagnetic-radiation/x6679aa2c65c01e53:em-radiation-from-the-sun/v/the-_greenhouse_effect 2024-06-16T20:56:57.951759647Z The greenhouse effect Earth receives a spectrum of electromagnetic radiation from the Sun which peaks in the visible range. Some of this light makes it to Earth's surface and is absorbed. The absorbed light is converted to thermal vibrations of charged particles, which then radiate infrared light. Greenhouse gases in the atmosphere (including carbon dioxide, methane, and water vapor) absorb the infrared light and then re-emit it in random directions. Some escapes to space, and some remains trapped in the atmosphere. The greenhouse effect keeps Earth warm enough to be habitable. However, human activities are increasing greenhouse gas concentrations and are thereby affecting Earth's climate system. Solutions to this problem include solar, wind, and nuclear energy, which do not emit greenhouse gases during operation. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/4b17ace8-7bca-436f-a549-ed079209c44f_1280_720_base.png The greenhouse effect Earth receives a spectrum of electromagnetic radiation from the Sun which peaks in the visible range. Some of this light makes it to Earth's surface and is absorbed. The absorbed light is converted to thermal vibrations of charged particles, which then radiate infrared light. Greenhouse gases in the atmosphere (including carbon dioxide, methane, and water vapor) absorb the infrared light and then re-emit it in random directions. Some escapes to space, and some remains trapped in the atmosphere. The greenhouse effect keeps Earth warm enough to be habitable. However, human activities are increasing greenhouse gas concentrations and are thereby affecting Earth's climate system. Solutions to this problem include solar, wind, and nuclear energy, which do not emit greenhouse gases during operation. https://cdn.kastatic.org/ka-youtube-converted/Yn7ICU3Q4mE.mp4/Yn7ICU3Q4mE.mp4 808 Greenhouse effect, global warming and their impact on climate https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:global-change/x0b0e430a38ebd23f:greenhouse-effect/e/greenhouse-effect 2026-04-15T05:40:45.550331962Z Greenhouse effect Apply your understanding of greenhouse effect in this set of free practice questions aligned to AP standards. exercise https://www.khanacademy.org/science/grade-8-science-tx/x3cd7525f789ab4f1:climate-change/x3cd7525f789ab4f1:changes-in-earth-s-climate-system/v/natural-changes-in-climate 2025-07-01T18:08:15.179962416Z Natural changes in climate Earth's climate has changed over time due to natural events and processes. Volcanic eruptions, meteorite impacts, ocean currents, and greenhouse gases have all driven changes in climate—sometimes suddenly, sometimes slowly. Scientists use ice cores, tree rings, and other natural records to uncover how these forces shaped Earth's past climate across centuries and millennia. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/a69f9ed1-04d5-4158-b7c1-ba659c686477_1280_720_base.png Natural changes in climate Earth's climate has changed over time due to natural events and processes. Volcanic eruptions, meteorite impacts, ocean currents, and greenhouse gases have all driven changes in climate—sometimes suddenly, sometimes slowly. Scientists use ice cores, tree rings, and other natural records to uncover how these forces shaped Earth's past climate across centuries and millennia. https://cdn.kastatic.org/ka-youtube-converted/KIcrEAEXXgk.mp4/KIcrEAEXXgk.mp4 394 Greenhouse effect, global warming and their impact on climate https://www.khanacademy.org/science/grade-8-science-tx/x3cd7525f789ab4f1:climate-change/x3cd7525f789ab4f1:changes-in-earth-s-climate-system/a/natural-changes-in-climate 2025-07-09T20:41:48.967358068Z Natural changes in climate Learn about how natural events (such as volcanic eruptions, meteorites, and changes in ocean currents) can affect climate. article https://www.khanacademy.org/science/grade-8-science-tx/x3cd7525f789ab4f1:climate-change/x3cd7525f789ab4f1:changes-in-earth-s-climate-system/e/understand-natural-changes-to-climate 2026-03-14T07:10:38.271946002Z Understand: natural changes in climate Check your understanding of how natural events influence climate in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise https://www.khanacademy.org/science/grade-8-science-tx/x3cd7525f789ab4f1:climate-change/x3cd7525f789ab4f1:changes-in-earth-s-climate-system/e/apply-natural-changes-in-climate 2026-02-27T18:20:42.63281182Z Apply: natural changes in climate Apply your understanding of how natural events influence climate in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise https://www.khanacademy.org/humanities/climate-project/x7467a46e12a31203:the-impacts-of-climate-change/x7467a46e12a31203:evaluating-climate-impacts-2-1/a/article-the-impacts-of-climate-change-cp 2025-06-10T13:35:50.832432202Z The Impacts of Climate Change Read about the difference between direct and indirect impacts of climate change, and how these effects are interconnected. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:biodiversity-and-human-impacts/x230b3ff252126bb6:global-change-biology/a/biological-impacts-of-climate-change 2024-06-12T19:16:42.550703216Z Biological impacts of climate change Learn about how climate changes affects life at all levels, from cells to ecosystems. article https://www.khanacademy.org/science/middle-school-earth-and-space-science/x87d03b443efbea0a:earth-and-society/x87d03b443efbea0a:human-impacts-on-the-environment/v/human-impacts-on-the-environment 2025-05-07T17:11:10.976262835Z Human impacts on the environment Human activities—such as land use, water use, and deforestation—often have negative impacts on the environment. These impacts worsen as the human population grows and consumes more resources. Science can help identify ways to reduce our impacts, but it is ultimately up to us to take action. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/5d88359d-4b8d-407f-86f3-06c1792814a4_1280_720_base.png Human impacts on the environment Human activities—such as land use, water use, and deforestation—often have negative impacts on the environment. These impacts worsen as the human population grows and consumes more resources. Science can help identify ways to reduce our impacts, but it is ultimately up to us to take action. https://cdn.kastatic.org/ka-youtube-converted/ThpzFgoGrKE.mp4/ThpzFgoGrKE.mp4 308 Greenhouse effect, global warming and their impact on climate https://www.khanacademy.org/science/middle-school-earth-and-space-science/x87d03b443efbea0a:earth-and-society/x87d03b443efbea0a:human-impacts-on-the-environment/a/human-impacts-on-the-environment 2025-06-10T13:35:50.832432202Z Human impacts on the environment Learn about how human activities can affect the environment. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:biogeochemical-cycles/a/human-impacts-on-biogeochemical-cycles 2024-05-09T17:42:08.599818576Z Human impacts on biogeochemical cycles Learn how human activities affect biogeochemical cycles. article