The first step on the long road of change is acknowledging that a problem exists.
Just because you can't imagine how you can effect change, doesn't mean it isn't possible. Problems of this scale require a sufficiently scaled solution. Economic sanctions and treaties would provide incentives for change. Hit Brazil's government and business leaders where it hurts: their wallets and their power on the world stage.
General awareness of a problem is needed to mobilize political action. If the solution to the problem is political, awareness of the issue might inspire direct action, or at least voting for policy that effects change.
A month ago I would have been more likely to find a more cut and dry factual assessment of these fires than I could today. The attention economy coupled with pandering to the lowest common denominator and the ROI of manipulating perception is paralyzing our ability to solve any problem.
This also hurts ordinary citizens in Brazil trying to make a living.