Lightbulbs: The more efficient they get, the more light we use

This is a cautionary tale about a few porch lights. Once upon a time, porch lights had incandescent bulbs. Eventually, many residents subbed them out with those swirly compact fluorescent bulbs, which use a quarter of the ...

Making Steel Recycling Greener

A new process developed by Siemens cuts the energy required to recycle steel and also lowers carbon dioxide (CO2) emissions.

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