Ecological footprint calculation

Lisa:

I need to calculate the amount of earths that would be required if everyone in the world had the same ecological footprint as me. The current world population is roughly 7, 140, 481, 761. My ecological footprint is 21. acres and there is only 28.2 billion acres of productive land and ocean available on earth. Help please. I need to know the calculations used as well.

Lisa

When there are big numbers in a question that look scary, just swap them for little numbers and see what you would do. Then do the same on the big numbers.
I'll show you what i mean.
Think about your question
The current world population is roughly 7, 140, 481, 761. My ecological footprint is 21. acres. What is the human population's footprint?
a similar question (though not a real one) could be
The current world population is roughly 10 My ecological footprint is 2 acres. What is the human population's footprint? 2acres each, 10people = 2 x 10 acres.
Now use the same the same logic to answer your 'real' question.

If you want to compare your answer to the 28.2 billion acres of productive land and ocean available, there is another little problem.
In Australia and the UK I think, 1 billion is 1million million = 1,000,000,000,000 = 10 ¹²
In the US 1 billion is 1thousand million = 1,000,000,000 = 10 ⁹

These sorts of discrepancies is one reason why it is better to use scientific notation when talking about big (or tiny) values.

POPO:

B***H F**K U. BACK THE F**K OFF YOUR MOM IS A HOE. STAY THE F**K AWAY FROM RESSIE WOMACK

Popo,
This behaviour is NOT ACCEPTABLE. People who behave like this are NOT WELCOME in this forum.
Melody