To limit how much global warming we cause [if we don't remove CD; from the air or block the sun}:
We must limit how much fossil fuel we burn, but also must limit methane, soot and other things.
We must limit how much fossil fuel we burn; nothing else matters
We must limit how much soot and methane we emit; nothing else matters 0 We must limit how much corn we grow, because it is the main cause of global warming
We don't need to worryr about anything, because humans don't cause global warming.