Coorelation between manmade GHGs and atmospheric warming. http://www2.sunysuffolk.edu/mandias/global_warming/fact-from-fiction.pdf Fiction:Greenhouse Effect Has Not Been Measured Only Modeled Evans & Puckrin(2006) measured the downward radiative flux for several important greenhouse gases. The greenhouse effect from trace gases in the atmosphere is real and adds significantly to global warming. Their data indicates that an energy flux imbalance of 3.5 W/m2has been created by anthropogenic emissions of greenhouse gases since 1850. This compares favorably with a modeled prediction of 2.55 W/m2. They concluded: "This experimental data should effectively end the argument by skeptics that no experimental evidence exists for the connection between greenhouse gas increases in the atmosphere and global warming." Increased CO2is preventing LW radiation from escaping the atmosphereand this decreasing LW radiation is accurately being predicted by models. Wang & Liang (2009) estimated downwellingLW radiation under both clear and cloudy conditions at about 3200 stations from 1973 to 2008 were presented. Daily downwellingLW increased at an average rate of 2.2 W/m2per decade from 1973 to 2008.The rising trend results from increases in air temperature, atmospheric water vapor, and CO2concentration.