This argument is entirely pointless. You’re proposing to purchase land - crucial natural resource - from a sovereign nation(s). I can’t begin to imagine what a fair price would be, if there is such a thing. 300 trillion dollars? Who would pay? The rich nation taxpayers? Would the population of these benefactors countries be happy with increased taxation for no direct impact in their lives? Private investors? What would they recoup their investment from,, “responsible” exploration of the land they are ostensibly saving? Not to mention the political and cultural implications of attempting to buy a resource from a nation, after the purchasers have used up their own for economical and geopolitical gain. I ask for forgiveness if the tone of this message is overly cynical, but we are past the point of thought exercises over the fate of this planet.

If a solution to preserve the Amazon is to be found, that will involve helping Brazil rise above the cesspool of corruption that its been steeped in for the past decades. Assistance with education and economic incentives for alternatives to heavy reliance on beef and grain exports. Heavy tariffs or outright ban of these products on the international markets. Punish the large agricultural and cattle business that are decimating the forest for gain, give the people alternatives for subsistence. Until that happens, little will change.