Air Date: Week of August 31, 2012

(Photo: Andy Coulson)

Scientists are developing genetically modified trees for the forests of the future. Ann Peterman of the Global Justice Ecology Program tells host Bruce Gellerman that these designer trees don't measure up wo what a real forest provides.

Transcript

GELLERMAN: From the Jennifer and Ted Stanley studios in Somerville, Massachusetts, this is and encore edition of Living on Earth. I'm Bruce Gellerman

Preserving the world's tropical forests holds great promise for reducing greenhouse gas emissions…but not all forests are created equal. There are natural forests, which are home to a wide variety of trees, plants and animal life, and then there are forest plantations - where a single type of tree is grown for its commercial value. Scientists are now experimenting with plantations, manipulating and modifying the genes of saplings that grow in these monoculture forests - and that’s a problem says Ann Peterman. She’s executive director of the Global Justice Ecology Project.

PETERMAN: One of the main trees that they're genetically engineering is eucalyptus. But they're also genetically engineering poplars and pines, so those three species are pretty much the three main forestry trees that they're genetically engineering. And they're mainly doing it either for pulp and paper, for cellulosic fuel – in other words biofuels made out of trees – or for timber, in the case of some of the pine. So they're genetically modifying them to enhance some of the traits.

In the case of timber, they want, you know, straighter trees or less branches or, you know, if they could grow two by fours that would make them very happy. Or in the case of paper, they want to actually create trees that have less lignin. Lignin is the structure in a tree that makes it strong, that protects it against insects, disease, fungus, etc, but makes it very hard to make paper or fuel. So if they have low lignin trees, they can more easily process them, they say, into paper or fuel.

GELLERMAN: When you say "they" you're talking about companies.

PETERMAN: Right, I'm talking about the paper industry, the biofuels industry, etc.

GELLERMAN: What's the problem. I mean, they're saying we need to be more sustainable, we need to grow sustainable products, provide for an ever-expanding population and this is good.

PETERMAN: Their argument is that this will grow more wood on less land. Less forest will be cut down because we can concentrate the amount of timber that we're growing on a piece of land. But as we've seen with traditional plantations that are already developed all over the world, they do not protect forests, they destroy forests. And the reason is because plantations are worth more money than natural forests. They can get more timber out of them or they can get a specific kind of timber out of them. In a natural forest they can't do that. So, it's worth more money.

GELLERMAN: So what you're saying is, it's a driver of deforestation. They would go in and they would deforest a natural rainforest or tropical forest. And then plant these plantation forests.

PETERMAN: Exactly, and you see that in Brazil. They've pretty much decimated the Mata Atlantica forest ecosystem in Brazil to replace them with eucalyptus plantations. Now they're talking about going into the Amazon and replacing parts of the Amazon with eucalyptus plantations. So, yes, tree plantations have been a huge driver of deforestation all over the world.

GELLERMAN: But a tree is a tree is a tree. I mean, if you cut down a tree and you're planting genetically modified eucalyptus in terms of carbon, is there a difference?

PETERMAN: There is actually, there's a huge difference. And it's not just, of course, the carbon storage, but the biodiversity, you know, the ability of the forest to sustain populations, human populations in a way that plantations can't. But getting back to the carbon issue, forests in tropical regions store four times the carbon of a tree plantation.

So when you destroy a natural forest and replace it with a tree plantation, you have just decimated the ability of that land to store carbon. Clearly, that's gonna have impacts on the climate, not to mention the actual act of deforestation itself has huge carbon emissions. Studies have shown that at the very least twenty percent of annual carbon emissions come from deforestation and more recent studies are saying it's probably considerably more than that.

GELLERMAN: In Brazil they are planning to count plantation trees as forest.

PETERMAN: Yeah, they do in many parts of the world. The UN allows plantations to be considered as forest. It's just an incredible bad definition of forest that the UN uses that allows this to happen and that desperately needs to be changed. In Brazil they call tree plantations green deserts because they're so destructive and because they are basically devoid of any other species except the monoculture of that tree.

GELLERMAN: And where on the planet is the number one place where they're planting genetically engineered trees?

PETERMAN: China, at this point. China's the only place in the world where they have commercially released genetically engineered trees at this point. The U.S. is in the process of trying to figure out if they want them to be legal here, Brazil is in a similar process, they're moving forward with it. But China is the only place where they actually have commercial plantations.

GELLERMAN: Ann Peterman coordinates work on genetic trees for the Global Forest Coalition and directs the Global Justice Ecology Project.

 

Links

Global Justice Ecology Project