"Brazil's new Forest Code means it will struggle to meet its targets on curbing greenhouse emissions, according to a former environment minister.
On the sidelines of the UN climate talks in South Africa, Marina Silva said the move will also reduce Brazil's global leadership on forests.
The Senate passed the new Forest Code late on Tuesday.
It will reduce the size of buffer zones around rivers, and weaken the amount of land that owners must leave forested.
Past breaches will not be punished if perpetrators agree to a plan of ecological restoration.
'The approved law will make it difficult - and by a lot - for Brazil to keep their emission targets,' Ms Silva told reporters."