How much are we as human contributing to global warming through methane gas ?

@pimagro24 (1046)
Thailand
October 2, 2008 3:47am CST
I read an article that basically said that animal are a contributing factor causing global warming due to the methane gas they produce . That being true, how are we helping it's progression by having over 4 billion people on the planet ? And could restriction on the amount of children we have help reduce its effect .
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