Several approaches to detaching the existence of a theoretically prediced CO2-induced signal in the global temperature field are investigated. It appears that a relatively thin network of observing stations can, when properly analyzed, provide a first-order estimate of global-scale temperature change and that this measurement is not necessarily the ''global average'' temperature. Using these stations, it is possible to estimate the strength of an a priori CO2 signal in the three dimensional tropospheric temperature field. This signal is derived from two different general circulation model simulations, both with some form of interactive oceans. The observed signal strength over 1960--1980 is roughly 0.5--1.0 times that expected ''theoretically.'' The observed signal demonstrated a trend that this marginally significant.