https://www.khanacademy.org/science/grade-8-science-tx/x3cd7525f789ab4f1:climate-change/x3cd7525f789ab4f1:the-carbon-cycle/a/the-carbon-cycle-teks 2025-07-29T17:44:04.121235593Z The carbon cycle Learn about the carbon cycle and the four main processes that move carbon through Earth's systems. article https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:energy-flow-in-an-ecosystem/x345505a97fc4a662:bio-geo-chemical-cycle/e/understand-the-carbon-cycle 2025-07-13T07:33:51.252224157Z Understand: the carbon cycle Check your understanding of the carbon cycle in this set of free practice questions aligned to NGSS standards. exercise 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 The Carbon Cycle https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:biodiversity-and-human-impacts/x230b3ff252126bb6:global-change-biology/a/phet-simulation-greenhouse-effect 2025-04-01T18:49:52.583009735Z PhET simulation: Exploring the greenhouse effect Follow the link to dive deeper into the greenhouse effect using an interactive PhET simulation! article