Video by National Public Radio (2.33 minutes)
At the end of 2011 The U.N. said the world's population reached 7 billion. A little more than two centuries ago, the global population was 1 billion. What happened? Let's see how the Earth can produce that kind of a crowd.
Watch the clip and complete the following notes with one or more words:
"...A thousand years ago there were only a third of a billion people. Now there's 7 billion of us.
How did we grow _________?
...The fuller the glass gets _________
Water drips in as_________
water drips out as_________
a thousand years ago the Americas are_________
better medicide and better agriculture are starting to slow the leak _________the glass
more babies gro up and_________ have babies of their own
The UN says we'll level out at 10 billion by _________
Can the world hold that many people?
Experts can't agree. It all depends on _________ our food, water and energy."
Answers here!
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