Carbon dioxide levels above normal will increase plant growth.
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The statement is true. Carbon dioxide above normal will increase plant growth provided all other conditions are suitable. Plants needs carbon dioxide to carry out the process of photosynthesis. When carbond dioxide is available in excess, plants tend to increase their rate of photosynthesis.

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.