Just a few things, take them as you will.
"The artificial production of carbon dioxide and its influence on temperature"
G. S. Callendar, Quarterly Journal of the Royal Meteorological Society
1938
"Infra-red absorbtion by carbon dioxide, with special reference to atmospheric radiation"
-- G. Callendar, Quarterly Journal of the Royal Meterological Society 1941
"Earth's Energy Imbalance: Confirmation and Implications"
James Hansen, Science 2005
Scotese, Paleomap project.
"The faint young sun problem" - Georg Feulner, American Geophysical Union Review of Geophysics, 2012
"Distinctive climate signals in reanalysis of global ocean heat content" -- Magdalena A. Balmaseda1 et al, Geophysical Research Letters, 2013
"Earth's energy balance and implications" -- Hansen et al, Atmospheric Chemistry and Physics, 2011
"An atmospheric pCO2 threshold for glaciation in the Late Ordovician"
-- M. T. Gibbs et. al, Geology; May 1997
Palaeoecology 1999
"CO2-forced climate thresholds during the Phanerozoic" -- D.L. Royer, Geochimica et Cosmochimica Acta, Dec 2006
"Celestial driver of Phanerozoic climate?" -- N. Shaviv and J. Veizer, GSA Today, 2003
"Bathymetric and isotopic evidence for a short-lived late Ordovician glaciation in a greenhouse period" -- Brenchley et al, Geology; April 1994
"Reconciling Late Ordovician (440 Ma) glaciation with very
high (14X) CO2 levels" -- CROWLEY T. J. ; BAUM S. K., Journal of Geophysical Research 1995