Science Scene - Climate Declared :o)

STOCKHOLM — Shopping for oatmeal, Helena Bergstrom, 37, admitted that she was flummoxed by the label on the blue box reading, “Climate declared: .87 kg CO2 per kg of product.”

New labels listing the carbon dioxide emissions associated with the production of foods, from whole wheat pasta to fast food burgers, are appearing on some grocery items and restaurant menus around the country.

People who live to eat might dismiss this as silly. But changing one’s diet can be as effective in reducing emissions of climate-changing gases as changing the car one drives or doing away with the clothes dryer, scientific experts say.

“We’re the first to do it, and it’s a new way of thinking for us,” said Ulf Bohman, head of the Nutrition Department at the Swedish National Food Administration, which was given the task last year of creating new food guidelines giving equal weight to climate and health. “We’re used to thinking about safety and nutrition as one thing and environmental as another.”

Some of the proposed new dietary guidelines, released over the summer, may seem startling to the uninitiated. They recommend that Swedes favor carrots over cucumbers and tomatoes, for example. (Unlike carrots, the latter two must be grown in heated greenhouses here, consuming energy.)

They are not counseled to eat more fish, despite the health benefits, because Europe’s stocks are depleted. And somewhat less surprisingly, they are advised to substitute beans or chicken for red meat, in view of the heavy greenhouse gas emissions associated with raising cattle.

If the new guidelines are heeded, some experts say, Sweden could cut its emissions from food production by 20 to 50 percent. An estimated 25 percent of the emissions produced by people in industrialized nations can be traced to the food they eat, according to recent research here. And foods vary enormously in the emissions released in their production.

Earlier studies of food emissions focused on the high environmental costs of transporting food and raising cattle. But more nuanced research shows that the emissions depend on many factors, including the type of soil used to grow the food and whether a dairy farmer uses local rapeseed or imported soy for cattle feed.

Next year, KRAV, Scandinavia’s main organic certification program, will start requiring farmers to convert to low-emissions techniques if they want to display its coveted seal on products, meaning that most greenhouse tomatoes can no longer be called organic. For example, farmers with high concentrations of peat soil on their property may no longer be able to grow carrots, since plowing peat releases huge amounts of carbon dioxide; to get the organic label, they may have to switch to feed crops that require no plowing.

Next year KRAV will require hothouses to use biofuels for heating. Dairy farms will have to obtain at least 70 percent of the food for their herds locally; many previously imported cheap soy from Brazil, generating transport emissions and damaging the rain forest as trees were cleared to make way for farmland.

I think that if we are going to get ahead of this issue, we are going to need to change the way we think about even the simple things - carrots or tomatoes, chicken or beef. I know that there is more we can do, and we do more every year. I hope it will be enough.