A recent post on Gary Price's Resource Shelf tipped us off to this website and collection of Human Population lesson plans from the Washington, DC-based Population Reference Bureau. From the Bureau's site, check out these examples:

Grade level: middle to high school
Time required: one week
Subjects: social studies, geography, and world history

Population Growth

• Q&A: Has the world's population changed much over time? 
• Teacher's Guide

Future Growth

• Q&A: When could world population stop growing?
• Teacher's Guide

Migration

• Q&A: How densely populated is the planet? 
• Teacher's Guide

Change 

• Q&A: Why does it take so long to slow or stop population growth? 
• Teacher's Guide

There are lots more. Check them out HERE.