"emission" - key terms from Wikipedia

emission
emission	credits
emission	factors
emission	figures
emission	group
emission	level
emission	limits
emission	line
emission	lines
emission	mix
emission	nebulae
emission	norms
emission	of greenhouse gases
emission	pattern
emission	performance
emission	reduction
emission	reductions
emission	spectra of rhodamine
emission	spectroscopy
emission	spectrum
emission	standards
emission	trading
emission	vehicle
european emission	standards
european union emission	trading scheme
field electron emission
field emission
field emission	electric propulsion
field emission	gun
ghg emission
lava emission
light amplification by stimulated emission
low emission	zone
plasma emission	spectroscopy
positron emission
positron emission	tomography
reduces carbon dioxide emission
secondary emission
single photon emission
single photon emission	computed tomography
spontaneous emission
stimulated emission
stimulated emission	of radiation
strong radio emission
submillimeter emission
synchrotron emission
thermal emission	spectrometer
thermionic emission
vehicle emission	standards
zero emission