Wednesday, October 1st, 2014 - 7:20 pm 
(Arizona time)

Ninety-three million miles away, the sun blazes energy toward Earth. When this energy reaches Earth, the energy transmitted in short wave-lengths (visible light, ultraviolet, etc.) penetrates our atmosphere and strikes the Earth's surface. Energy in long wavelengths (such as infrared, thermal radiation or heat) is absorbed by carbon dioxide and other gases in the atmosphere. When penetrating short wavelengths strike Earth, they are converted into long wavelengths (in the form of heat radiation) and reflected back toward space. Some thermal radiation escapes, but most of it remains trapped inside our atmosphere. These long waves build up and keep Earth warm. This phenomenon, known as the greenhouse effect, enables life to flourish on Earth. Its future effects are also the subject of much discussion.

greenhouse

AzSC Blog

There’s a lot of work (to do)...

Earlier this summer the Environmental Protection Agency (EPA) released its proposed rules for Section 111(d) of the Clean Air Act. This is the rule that deals with reducing carbon emissions from existing power plants by 2030. The proposed rule was shaped by public input and builds upon existing priorities, activities, and efforts in states throughout the country.

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