efficacy, definition of

Greenhouse gases are those gaseous constituents of the atmosphere, both natural and anthropogenic, that absorb and emit radiation at specific wavelengths within the spectrum of thermal infrared radiation emitted by the Earth’s surface, the atmosphere itself, and by clouds. This property causes the greenhouse effect.

Greenhouse gases are essential to maintaining the current temperature of the Earth; without them the planet would be uninhabitable.

Wikipedia Entry

• Appraising Marvel et al.: Implications of forcing efficacies for climate sensitivity estimates
  A guest article by Nicholas Lewis Note: This is a long article: a summary is available here. Introduction In a recent paper[1], NASA scientists led by Kate Marvel and Gavin Schmidt derive the global mean surface temperature (GMST) response of the GISS-E2-R...
• Universal Display Unveils the Most Efficient OLED Kitchen Lights Ever Produced
  The team at Universal Display Corporation recently unveiled prototypes of a sleek, modular OLED kitchen light that blows away a set of environmental specifications proposed in a challenge funded in part by the US Department of Energy...