Ahead of the summit, Brazilian President Luiz Inácio Lula da Silva had called for a common goal of ending deforestation by 2030, a policy his own government has already adopted.
In his opening speech on Tuesday, Lula spoke of the "severe worsening of the climate crisis" and said "the challenges of our era, and the opportunities arising from them, demand we act in unison".
Deforestation in Brazil has fallen dramatically since Lula won the presidency from predecessor Jair Bolsonaro, who favoured development over conservation, but thousands of sq km continue to be lost each year.
It also included commitments to enhance co-operation on issues like water management, health, sustainable development and common negotiating positions at global climate summits.
Some will be disappointed the language is not stronger, but the summit has signalled a desire among countries in the region to work towards solutions to one of the biggest challenges of our time.
The summit opened on the same day that the European Union's climate change panel confirmed that July had been the hottest month on record globally.
This is like every other issue related to climate change.
Too many powerful people simply will not take the problem seriously enough until the consequences become obvious. Unfortunately, by the time the consequences become obvious, it will be far too late.