"tendency_of_X" means derivative of X with respect to time. The construction "atmosphere_moles_of_X" means the total number of moles of X in the entire atmosphere, i.e. summed over the atmospheric column and over the entire globe. The chemical formula for hcc140a is CH3CCl3. The IUPAC name for hcc140a is 1,1,1-trichloro-ethane.