Almost 7 billion.
more than there are people in the world (not a fact... but probably true) (sorry!)
No records exist of all the people with a common first name, but there are thousands of Tracys.
4 billion celluar telephones exist in the world :)
A coach suitable for a dog does exist in many parts of the world. There are many people who are specially trained to coach dogs in various sports or simply to tame the dog.
Black people don't exist, they are a reflection of light off of our cornea that makes them appear shadowy.
Many people around the world still support prohibition of alcohol,
People can be gay. There are many gay people in the world.
Britnee and Nat do exist. There are a large number of people with these names in the United States, so they do exist in the world.
There are 15 species of old world vultures that exist and 7 species of new world vultures that exist. Turkey Vultures are the most common in the world.
Yes famine still exist in many parts of the world.
The world will cease to exist
Probably about as many as there are people.