In order to help the student expand his/her knowledge I will help answer the question. This in hope that the student will get a piece of knowledge that will help him/her through his/her homework or future tests.
Compared to Earth’s average climate throughout history, Earth’s current climate is warmer. This is due to the fact that we spend many years polluting the earth. As a result global warming is affecting the earth slowly changing climate. The correct choice is letter
B. Warmer
I hope it helps, Regards.