redOrbit: NOAA has released the first-ever study of the climate impacts of the man-made substance, nitrous oxide. Researchers A.R. Ravishankara, J.S. Daniel and Robert W. Portmann of the National Oceanic and Atmospheric Administration’s Earth System Research Laboratory (ESRL), said that nitrous oxide, also known as laughing gas, has become the largest ozone-depleting substance emitted through human activities. Additionally, the gas is expected to continue its status through the 21st …