you're right and wrong...
All energy dies eventually go to heat (vibration of molecules), but your assumption that the temperature of the earth will increase has a key flaw, that the earth is a closed system. In reality, most of the extra energy that we produce will also be lost to space as radiation. There will be a change in the equilibrium point, but it will be small.
Think of it like a fridge, our energy use is like putting a bulb in the fridge, greenhouse gas build up would be like opening the door (not a great analogy, but hopefully the intent is clear?
apologies for erroneous worda, this is done on my phone
(Hill Dog loves planes, Tue 6 Dec 2011, 18:34, Reply)