103840
These sources suggest that the clathrate gun effect alone will not be sufficient to cause ' catastrophic ' Earlier estimates were based on the assumption that fossil-fuel use would continue until reserves were exhausted , and predicted a runaway greenhouse effect , a climate similar to that on Venus .
 Venus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Venus