This reads as an opening blog on the front of a book or as the description of the story if you are going high-tech and using one of the online book-selling sights.

From what you have written we know there is a race of beings, superior in space travel who visits Earth on a regular basis to refuel their ships. They use water for this. During their many trips to “the little blue planet”, they have decided they are superior to Earthlings in every way. When their “fuel source” is threatened they decide to get rid of humans, except for a select few who will be kept on display in some type of zoo.

*** much to the amusement of the interstellar travellers, as they often play 'catch me if you can' (double quotes needed) with the most advanced of the native's craft.
*** So quickly have the The humans gained in numbers, along with their use of fossil fuels without any thought towards the future is becoming a problem.
***Then, a A decision is made, and as the craft sets off on its mission, there is a degree of sadness among those who have decided the fate of so many.
***And as As the craft arrives to release its payload on the unsuspecting billions,

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