5617
so we ' re going to have to come up with some conversion technique to create water , to create oxygen and then some way of growing food on the planet itself .
 we, the planet, itself
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 we, the planet, itself