So today I was challenged by my Uncle because he says that we are going to run out of drinkable water on earth before we run out of Oil, I told him that he is just saying that to scare me but he honestly thinks that this is true. So I wanted to do the math for him to prove that we have nothing to worry about. But I got a lot of it finished but I have hit a brick wall, I do not think my math is correct so I would like you guys to help me prove that my math is correct.
Volume of Earth in Cubic meters: 260,000,000,000 cubic miles
Volume of (any) water on Earth: 75% of earth's volume, 260,000,000,000 * 0.75 = 195,000,000,000 cubic miles
Volume of drinkable water on earth: 1% of Water, 195,000,000,000 * 0.01 = 1,950,000,000 cubic miles
Conversion of Cubic Miles to Gallons: 1 Cubic Mile = 1.101117147e+12
Gallons of Drinkable water on Earth: 2.147178437e+21
Conversion of Gallons to Ounces: 1 Gallon = 128 Ounces, Total of 5.359357378752e+32 Ounces
Average person consumes: 64 Ounces of Drinking Water per day
People on earth: 6.5 Billion
Average amount of ounces each person drinks of water per day: 64 * 6,500,000,000 = 416,000,000,000 Ounces of Drinking Water per day for every person on earth
How many days earth drinking water would last with this amount: 5.359357378752e+32 / 416,000,000,000 = 1288307062200000000000
I just want some math people to check my work. I am only 15 trying to debate with a 40yo haha, I do not want to screw up.
Thanks for any help and it is well appreciated!