Why does the author mention "current projections about the possible effects of global warming" in the passage? A. To argue that global warning was a factor in the climate shift of the fourteenth century in Europe B. To suggest that the current climate change is greater than the climate change in the fourteenth century in Europe C. To show the direct connection between temperature changes in the fourteenth century and changes that are currently occurring in Europe D. To emphasize the impact of the temperature change that occurred during the fourteenth century in Europe