Brazil Environmentalist Silva, Former PT Rival, All-in With Lula Against Bolsonaro

Marina Silva, a former environment minister under ex-President Luiz Inacio Lula da Silva and once his rival, told Reuters she is throwing her full support behind his campaign and did not rule out an eventual role in his government if he wins a third term.

Silva resigned from Lula's government in 2008, upset at his government's support for major infrastructure projects in the Amazon, and their reconciliation is a high-profile endorsement to shore up his center-left coalition ahead of an Oct. 2 vote.

Her support for Lula also shows how even environmentalists skeptical of his ties to Brazilian agribusiness have closed ranks behind him, in an urgent push to change policies that have sent deforestation soaring under President Jair Bolsonaro.

Silva implemented environmental policies under Lula that helped to dramatically reduce destruction of the Amazon, but she joined a chorus of green critics upset with major infrastructure projects in the rainforest like the Belo Monte hydropower dam.

Even with that mixed record, Lula strikes a dramatic contrast with Bolsonaro, who has sharply scaled back enforcement of environmental laws in the Amazon, while calling for more mining and farming on protected lands. Deforestation of Brazil's rainforest has climbed to a 15-year high on his watch.

In an interview on Thursday, Silva, a three-time presidential candidate who drew fierce criticism from the PT in prior campaigns, said that "zeroing" deforestation in the Amazon was entirely within reach, a goal that is even more ambitious than Lula's stated target of "net zero" deforestation.

While net zero deforestation allows for cutting as long as an equal area is replanted elsewhere, no cutting whatsoever would be allowed under a pure zero deforestation regime.

"It's perfectly possible to return to zero deforestation, reviving a plan that already worked, updating that plan, putting the budgets and teams back together, strengthening our enforcement, monitoring and management systems," said Silva, a native of the isolated, rainforest state of Acre.

Last week, Silva publicly endorsed Lula at an event where he committed to a series of policy proposals, including a national authority coordinating the government's work on climate change.

Asked if she would consider accepting a role like "climate czar," which Lula has floated, Silva left the door open.

"This is a decision for the president of the republic," she said. "In this moment, talking about ministries before winning is exactly what we don't have to do."

Lula has built a strong lead over Bolsonaro in most polls. If neither candidate wins a majority of votes on Oct. 2, they will face off in a second-round vote on Oct. 30.