anthropogenic greenhouse gas emissions show an increase in temperatures that closely tracks observations.
On the basis of models that assume different technology, economic, and policy trajectories, the IPCC has developed several scenarios of future emis-
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2 The Challenge of Global Warming ."
The National Academies Summit on America's Energy Future: Summary of a Meeting . Washington, DC: The National Academies Press,
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As of 2013, the National Science Education Standards have been replaced by the Next Generation Science Standards (NGSS), available as a print book, free PDF download, and online with our OpenBook platform.
The NGSS offer a detailed description of the key scientific ideas and practices that all students should learn by the time they graduate from high school. The standards are based largely on the 2011 National Research Council report A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas.