As part of international efforts to limit climate change, Brazil this week ratified its promise, made in Paris last December, to cut its climate-changing emissions,
It was the third big country in the world to do so, behind only the two biggest emitters: China and the United States.
Brazil said it would reduce its emissions by 37 percent by 2025, compared to levels in 2005, and by 2030 emissions would drop by 43 percent.
It also said it would restore 12 million hectares of forest by 2030, eliminate illegal deforestation and expand the use of renewable energy sources other than hydropower in its energy mix to between 28 percent and 33 percent.
But now comes the biggest challenge: to translate those numbers into actions.