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  • Milankovitch cycles Featured Article Milankovitch cycles Milankovitch cycles

    Milankovitch cycles refer to long term variations in the orbit of the Earth which result in changes in climate over periods hundred of thousands of years and are related... More »

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Lesson Plans: Global Climate Change: The Effects of Global Warming - CLEAN Last Updated on 2014-04-04 15:30:43 Selection for the CLEAN Collection. Summary by the CLEAN reviewers:  Activity takes three to four class periods. Technology to show videos and additional materials are needed. The activity follows a progression that examines the CO2 content of various gases, explores the changes in the atmospheric levels of CO2 from 1958 to 2000 from the Mauna Loa Keeling curve, and the relationship between CO2 and temperature over the past 160,000 years. This provides a foundation for examining individuals' input of CO2 to the atmosphere and how to reduce it. Objectives by the developer of the original resource. Understand how atmospheric levels of CO2 relate to climate change and global warming. Explore the effects of global warming on the environment, as indicated by the changes in Earth's glacial ice. Consider the... More »
Video: Earth as a System - WGBH - CLEAN Last Updated on 2014-03-14 15:36:09 Video length: 5:30 min. This activity has been selected for inclusion in the CLEAN Collection based on the following review comments: This short video uses animated imagery from satellite remote sensing systems to illustrate that Earth is a complex, evolving body characterized by ceaseless change. Adapted from NASA, this visualization helps explain why understanding Earth as an integrated system of components and processes is essential to science education. This video offers a general overview of the complexities of the Earth System including climate; some details, such as the role of subduction and volcanism to the long term carbon cycle, are not included. Connections to human impacts on climate are embedded in the video. Comments from expert scientist: Highlights the interactive nature of Earth's systems, eg. the role the oceans play in weather. Mentions that... More »
Speed Science - Soil Organic Matter - CSCAP Last Updated on 2014-03-14 14:42:00 Published on Aug 19, 2013 Soil organic matter is the topic. Filmmakers and narrators are a few of the participants in the Climate and Corn-based Cropping Systems Coordinated Agricultural Project, a USDA-NIFA project.  Filmed at the Purdue Crop Diagnostic Training and Research Center in Indiana, on July 31, 2013. More »
Speed Science - Cover Crops Fall Seeding Last Updated on 2014-03-01 17:48:56 Published on Sep 13, 2013 Snapshot of the benefits of cover crops and when and how to plant them in the Midwest. Filmed at a cover crop field day, at Mark Jacobs' Farm in Hedrick, Iowa, September 11, 2013. The video was developed in cooperation with Practical Farmers of Iowa, Iowa Learning Farms, and this project--the Cropping Systems Coordinated Agricultural Project, a regional collaboration supported by USDA-NIFA Award No. 2011-68002-30190. Filming and editing by Jamie Benning, a co-PI of this project's Extension Team.  More »
Speed Science - Plot Design Options for On-Farm Cover Crop Trials - Mark Licht, Iowa State University Last Updated on 2014-02-28 18:48:12 Published on Feb 17, 2014 Mark Licht, extension field agronomist for Iowa State University, discusses strategies for planning, implementing, and testing cover crops. This lecture was part of the "Implementing Cover Crops to Improve Cropping System Resilience" workshop in Story County, Iowa, at the Field Extension Education Laboratory on April 2, 2013. Two handouts referred to in this video are available at the Sustainable Corn Website at The workshop was developed in partnership with the USDA-NIFA Sustainable Corn project. For more information about this project, see Other partners included Iowa State University Extension and Outreach, Practical Farmers of Iowa, Iowa Learning Farms, the Agricultural Research Service and North Central Sustainable Agriculture Research & Education. More »