What do you think is the greatest enemy of mankind?
You are a disgrace to the human race!
Aya insisted that bacon is one of the most important things for humankind to hand down to future generations.
If you categorize people into types, you have different races of people. Or, you can categorize people as one type of "people" in this universe. If you did this, you'd call us mankind.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.