Read here. The essential foundation of the AGW hypothesis is that CO2 atmospheric increases block the escape of infrared radiation and increasingly bounces the infrared warming back to the Earth's surface to warm it. But when examining the empirical evidence, the infrared radiation bouncing back to Earth is mostly decreasing, not increasing. This is a likely the explanation for the disappearing global warming over the last 15 years.
Simply put, this is the exact opposite of what IPCC climate models and its faux climate scientists predicted.
Researchers Gero and Turner, using highly accurate technology, measured the decreases of infrared radiation reaching the surface and contend the decrease is due to increased cloudiness over the site - that's called a negative feedback, which Dr. Roy Spencer has presciently espoused.
"A study published online yesterday in The Journal of Climate, however, finds that contrary to the global warming theory, infrared 'back-radiation' from greenhouse gases has declined over the past 14 years in the US Southern Great Plains in winter, summer, and autumn. If the anthropogenic global warming theory was correct, the infrared 'back-radiation' should have instead increased year-round over the past 14 years along with the steady rise in atmospheric carbon dioxide"......"A trend analysis was applied to a 14-year time series of downwelling spectral infrared radiance observations from the Atmospheric Emitted Radiance Interferometer (AERI)...The AERI data record demonstrates that the downwelling infrared radiance is decreasing over this 14-year time period in the winter, summer, and autumn seasons but is increasing in the spring; these trends are statistically significant and are primarily due to long-term change in the cloudiness above the site." [P. Jonathan Gero and David D. Turner 2011: Journal of Climate]