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Last updated: April 28, 2012 1:03 am
In Brazil, sugar is king. In the field, on the table, on the road – and in the laboratory. The world’s largest sugar producer has been fermenting sugar cane juice into ethanol (alcohol) for motor fuel since 1975. For many years, the Brazilian bioethanol programme carried on in virtual isolation from the rest of the world, using fairly low-tech methods. Now, however, Brazil’s federal and state governments are pouring hundreds of millions of dollars into research aimed at improving all stages of the bioethanol process, from sugar cane biology to engine efficiency. And the process has become big science, as well as big business.
Brazil has a good track record in research in many areas of science and technology, but “bioenergy is the field in which we have most to contribute to the world,” says Carlos Henrique de Brito Cruz, scientific director of Fapesp, the São Paulo state research foundation.
Although the development of ethanol has been driven primarily by energy security concerns rather than environmental motives, Brazil is now emphasising the fuel’s green credentials. Net emissions of carbon dioxide from a car running on sugar ethanol are just 20 per cent of those from a petrol-fuelled car.
“Until about 2007 the world considered bioethanol to be our weird, tropical idea, and left us to get on with it,” says de Brito Cruz. “The game changed when George W Bush made biofuels an energy priority, and other countries entered the field. Then, we set up a bioenergy programme, to protect our intellectual property.”
Brazil produces more than 20bn litres a year of ethanol from sugar, to fuel the country’s 13m “flex” cars, which can run either on pure alcohol or on petrol (which itself contains about 20 per cent of added ethanol). A Brazilian petrol station often dispenses four fuels: ethanol, petrol, biodiesel and natural gas.
Increasing demand, combined with poor growing conditions in some sugar cane regions, has led recently to ethanol shortages – and an embarrassing need to import more than 1bn litres of US alcohol, produced from corn (maize), which is far less environmentally friendly.
With Brazilian ethanol demand expected to reach 50bn litres a year by 2020, the bioenergy programme aims to achieve a large increase in supply without a corresponding increase in the farmland devoted to sugar cane. Currently, this covers just 0.4 per cent of Brazil’s total land area, or 2.9 per cent of the land set aside for crops. In the case of Brazilian ethanol, biofuel does not represent a significant diversion of land and resources from food production. At present, Brazilian farmers average 84 tonnes of cane per hectare per year, according to Glaucia Souza of the University of São Paulo, who co-ordinates the Fapesp bioenergy programme. She calculates that the yield could be multiplied more than fourfold, to 380 tonnes per hectare, by improving the crop and its cultivation.
The task is made more difficult by the complexity of the biology and genetics of sugar cane, a hybrid of two grass species, Saccharum officinarum and Saccharum spontaneum. Indeed, the genome of sugar cane has not yet been fully decoded, despite intensive research in recent years.
Marie-Anne van Sluys, botany professor at the University of São Paulo, says the problem is not just the size of the sugar cane genome, which has five times more DNA than humans; the genome’s “decaploid” nature means that every sugar cane plant has the equivalent of 10 different genomes, compared with two in “diploid” mammals (one from each parent).
Although genetic modification should be possible without knowledge of the entire genome, attempts to create stable GM varieties of sugar cane have so far failed: introduced genes are quickly silenced or shut down by the plant.
Even so, Brazilian scientists are confident that the genetic mysteries of sugar cane will soon be cracked. According to van Sluys, the priorities then will be to make the plants more resistant to drought and pests, and change their physiology to divert as much metabolic energy as possible into making sugar.
In Brazil, the reign of the cane is just beginning.
Space agency flies in to save the rainforest
When people think about space science, they usually imagine researchers looking out into the cosmos. But an important role of space agencies is to look down on Earth – and Earth observation is the primary mission of Brazil’s National Institute for Space Research.
Inpe (as the institute is known from its Portuguese initials) has developed one of the world’s most advanced environmental monitoring systems. It tracks what is happening on the ground – and, above all, in the Amazon rainforest – as this huge country expands its population, economy and agricultural production.
Using its own satellites – and remote sensing data bought in from bodies such as Nasa and the European Space Agency – Inpe monitors Amazon deforestation on a daily basis. A supercomputer processes the raw satellite data, looking for evidence of illegal logging, burning or forest clearance. And when Inpe detects something suspicious it alerts local law enforcement agencies.
The latest climate prediction modelling shows that the Amazon basin may not suffer a catastrophic drought later this century due to global warming, despite recent fears
Although Brazil’s environmental policing has many imperfections, Gilberto Câmara, Inpe’s director-general, insists that the alerts have led to a substantial reduction in Amazonian deforestation in recent years. In 2011, 6,238 sq km of forest were lost – the smallest area since satellite monitoring started in 1988. As recently as 2005, the annual deforestation rate was more than 25,000 sq km.
Inpe does not send the satellite observations only to its own government and law enforcement agencies – all the data are made freely available to anyone, anywhere in the world.
“We used to sell remote sensing data, like other space agencies,” says Câmara, “but in 2004 we opened it all up for free. We used to sell 1,000 images a year; now we distribute 500,000 images freely around the world. Full and open access to space-based information is indispensable for global sustainable development.” Câmara is critical of agencies elsewhere that restrict public access to environmental monitoring data.
Satellite monitoring shows not only how much forest is lost, but also what the cleared land is used for – most becomes pasture for low-intensity cattle ranching.
“Of the 720,000 sq km of Amazon forest lost so far, about 65 per cent is used for cattle,” Câmara says. “This means that Brazil has lost an enormous amount of biodiversity just to graze cattle at about one head per hectare.” Just 5 per cent of former forest land is devoted to growing commercial crops – mainly soya beans.
Such information can be commercially, as well as environmentally, valuable. For instance, Inpe provides the data to enforce a soya moratorium. In place since 2006, and endorsed by Greenpeace, this agreement commits all of Brazil’s big soya traders to buy only from farmers who can prove that their land did not come from illegal deforestation. So, soya grown on uncertified land is worth less on the market.
Câmara says that most space agencies around the world exist at least partly “for geopolitical and military reasons”, such as supporting a domestic aerospace industry. Inpe is different, he claims: “Our aim is to support the development of a peaceful, green economy in Brazil.”
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