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Originally Posted by Toy Soldier
It's not dubious, like I said there are OTHER environmental considerations (huge ones) with grass vs. trees but the one that is thrown around all the time in the press / social media etc. is oxygen production... that we would lose 20% of the world's oxygen generation if the Amazon was completely replaced by farming / grazing... and it's just flat out false.
On the other hand, the ocean creates 50% of the planet's oxygen supply and we're slowly killing that, too... and that's not being replaced by anything at all. If the oceans die, we drop 50%, which is sort of terrifying really.
And I think grass removes less CO2 than an equivalent patch of rainforest... and CO2 in the atmosphere is raising the ocean's acidity levels... so I guess the numbers get even more complicated there, with the destruction also having other indirect effects. 
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How is it flat out false?.. as said the only argument I've seen for grass over trees is the risk fire poses to trees releasing their carbon back into the atmosphere..it was nothing to do with oxygen production. Where's the evidence?