I guess the million dollar question is - who has the moral authority to tell Brazilians that they don't have the right to utilize their land and natural resources like China, USA, India, and every other industrial nation?
That is going to be a very thorny issue in the years to come, thorny enough to lead to armed conflict. Climate change is a threat to humanity, much less a huge threat to the national security interests of any nation with a military. At some point the situation is going to be serious enough that military conflict will occur over water rights, environmental destruction, climate refugees, etc.
I imagine that before that happens, some country (or countries) will get hit with sanctions for environmental destruction. Of course that will be fraught because who isn't guilty of that?
But at the end of the day, what does it matter when the future of civilization is at stake? Why should the world stand by while Brazil (or any other country) destroys THE essential ecosystem in combating climate change. 100 years from now if the Amazon is gone people will wish other countries had put a stop to the destruction with sanctions or even military force.
Either way, the amount of land and water required to raise each lb of beef is an order of magnitude greater than the amount needed for a pound of chicken, which is in turn an order of magnitude higher than the resources needed for a pound of vegetables. The expanding demand for beef is ecologically unsustainable, doubly so if people are burning down critical environments to create cow pasture.