> No matter what technology, there will be an absolute upper limit of what population earth can bear. The Puppeteer Homeworld in Larry Niven's Known Space is s

> No matter what technology, there will be an absolute upper limit of what population earth can bear. The Puppeteer Homeworld in Larry Niven's Known Space is so largely populated they have to cool the planet down due to the passive energy output by the inhabitants. That always struck me as a pretty unrealistic barrier to beat. https://scifi.stackexchange.com/questions/1517/puppeteers-homeworld-heat-a-major-problem https://scifi.stackexchange.com/questions/1517/puppeteers-ho...