CFCs are crucial in global warming along with their role in ozone depletion as it

The correct option is "absorbs earthshine in 10 micron region".

Step-by-step Explanation:

1. Understanding the Greenhouse Effect and Earthshine:
The Earth absorbs solar radiation from the Sun and re-radiates this energy back into space as thermal infrared radiation (often referred to as "earthshine"). The wavelength spectrum of this outgoing longwave radiation peaks in the infrared region, primarily between 8 to 15 micrometers (microns).

2. The Atmospheric Window:
The Earth's atmosphere is relatively transparent to infrared radiation in the wavelength range of 8 to 12 microns (often centered around 10 microns). Because major natural greenhouse gases like water vapor ($H_{2}O$) and carbon dioxide ($C{O}_2$) do not strongly absorb in this specific band, it is known as the "atmospheric window", allowing thermal radiation to escape directly into space and cool the planet.

3. The Role of CFCs (Chlorofluorocarbons):
CFCs are synthetic compounds that possess strong absorption bands precisely within this 8 to 12 micron atmospheric window, specifically near the 10 micron wavelength. By absorbing the outgoing "earthshine" in this critical region where it would otherwise escape, CFCs trap thermal energy in the lower atmosphere, acting as extremely potent greenhouse gases that contribute significantly to global warming.