Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

Paragraph- Sent 1: Imagine a glass of your favorite drink that never became empty.
Sent 2: Now think about what really happens.
Sent 3: You take a drink and there is less in the glass.
Sent 4: You keep drinking and soon it is all gone.
Sent 5: Good thing you have more to refill your glass.
Sent 6: What if there would never be any more of your favorite drink.
Sent 7: What would you do?
Sent 8: Now you know the difference between renewable and non-renewable.
Sent 9: Its too bad that many things here on Earth will run out.
Sent 10: This includes some of our natural resources we depend on.
Sent 11: Things like oil will not last forever.
Sent 12: There is a limited supply.
Sent 13: Someday, we will run out, so then what?
Sent 14: At current rates of use, coal will last about 300 years.
Sent 15: Petroleum will be used up in just a few decades. 
Question: What scenario does the author use to illustrate the difference between renewable and non renewable resources?.
He/she uses a glass and ones favorite drink, one case of were you always have that drink to fill the glass and no scenario there is no more to fill up the glass.