You don't need to cite, you need to provide source code. The point of GPL is to allow the user to inspect and modify the software. You can even sell it as long as you provide the modified source code under the same license.
The main character in I, Robot is Dr. Susan Calvin. It also features Donovan and Powell. Elijah is from the robot trilogy, which happens centuries after I, Robot.
I would say the only thing the movie has in common with the book is that it mentions the book's main character and the laws of robotics. The book is all about weird behavior of robots that actually obey the laws but the movie just treats them as some corporate doublespeak.
I calculated at one point that if you ride a bike instead of a car but replenish the calories with pure beef, it is better to ride the car. So diet matters.
Funny how we've regressed back to a state where you can only believe things you have seen with your own eyes. (And things in books, papers and old-school websites.)
Of course there is a limit. The question is how high it is. For instance, at high enough CO2 concentrations, the greenhouse effect doesn't get much stronger anymore. Also, the more CO2, the faster it dissapears by eroding rocks. That happens on a geological timescale, though.
If we did something to lower temperature, I'd be very worried about the CO2 concentration's other effect: feeling like suffocating all the time.
You don't need to cite, you need to provide source code. The point of GPL is to allow the user to inspect and modify the software. You can even sell it as long as you provide the modified source code under the same license.