Countdown: 59 Days to Go - Greenhouse
There are lots of little details that maybe nobody will ever notice but where the production designers attempted to add a degree of realism to Ender's world. One example is the heat radiators spread all over the station to pump the heat out of Battle School. Those were added when a consultant warned: "The heat going in that thing, you're gonna cook these kids. It's a greenhouse!"
Source: Film School Rejects