Co2 has been referred to a greenhouse gas because it acts to trap the sun’s heat on our planet like the glass in the greenhouse traps the sun heat in the room what does the graph indicate is the relationships between global temperatures and and co2 concentrations

Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.