Heirloom tomatoes at a farmers’ market in San Francisco. Photo: advencap.

It is high season for tomatoes right now. Your local farmers’ market probably has a whole color spectrum of heirloom tomatoes, from red to green and purple, deepening to almost black. Heirloom tomatoes are getting more and more popular—but what does “heirloom” really mean? And how do these colorful tomatoes differ from their supermarket relatives?

What does “heirloom” mean, anyway?
In agriculture, the word “heirloom” doesn’t have a precise definition. It conjures up ideas of a food that is old fashioned and has been handed down for generations—which is as good a definition as any right now. Heirloom tomatoes are varieties that have been grown without crossbreeding for 40 or more years. This is in contrast to the typical supermarket tomatoes, which are hybrids that have been carefully crossbred to have particular characteristics. Often flavor is not at the top of the list. Instead, hybrid tomatoes are bred for things like resistance to pests and diseases, and firm flesh and thick skin—so they can be harvested by machines and emerge as whole tomatoes, not sauce.

But genetic mixing—or lack thereof—isn’t the only thing that separates the heirlooms and the hybrids. Let’s look at some heirloom tomato myths and truths, to get at other difference between the two tomatoes.

You can grow heirloom tomatoes from their seeds.
Correct. Hybrid Heirloom tomatoes breed true—if you take the seeds from your heirloom tomatoes, treat them right, and then plant them in the spring, the tomatoes you pluck from the vines in late summer will taste just like their parents tasted. One characteristic of heirloom crops is that they are open-pollinated; pollen is carried by natural mechanisms, like bees or wind. Compare this to commercially grown hybrid tomatoes, which must be pollinated by hand to ensure the correct combination of traits. This is a lot of work, but it’s necessary. Open-pollinated hybrid seeds might carry the good genes for a particular trait, or they might the carry bad genes. The only way to ensure a good crop of hybrids is to plant seeds that have been hand-pollinated so you get the right mix.

Heirloom tomatoes are organic.
Not necessarily. Often they are organic, but they would still be called heirlooms if growers treated them with pesticides and other chemicals. And growers would have good reason to spray: heirlooms don’t have the disease and pest resistance that hybrids have acquired over generations of selective breeding. Heirlooms are particularly susceptible to fungus, which makes them crack and split. Farmers growing heirlooms get one-third the yield (or even less) than they would if they were growing hybrids, because so many plants and fruits are damaged by pests and disease. This is one reason why heirloom tomatoes are so expensive.

Heirlooms taste better.
Often this is true, and there are a couple of reasons for it; some are inherent to heirlooms, and some are byproducts of the way they’re grown and harvested. An heirloom tomato plant often produces a total of only two fruits; all the plant’s reproductive efforts get concentrated into just a few tomatoes. This concentrated effort could be making the tomatoes more flavorful. And, heirlooms usually have more locules—the cavities with the seeds—than commercial hybrids. These locules are flavor centers, full of volatile compounds. Hybrids are less flavorful because they were never bred for flavor—although that is changing. Plus, heirlooms are often grown locally and allowed to ripen on the vine, as opposed to typical supermarket hybrids, which are picked when firm and green, and are ripened to redness in a warehouse with ethylene gas. When and how tomatoes ripen affects their flavor.

Heirlooms are better for you.
False: there is no evidence for this. Heirlooms don’t have more nutrients or anti-oxidants than hybrids.

A tomato tip.
Whether your shopping cart is full of heirlooms or hybrids, whether they’re red or yellow or deep purple, don’t put those tomatoes in the fridge. The cold temperature decreases whatever flavor they may have.

The 2011 Chevy Volt at the 2010 Plug-In Conference. Photo by Sheraz Sadiq

Originally reported for KQEDnews.org.

After years of stops and starts, electric cars and plug-in hybrids are on the cusp of a new era of mainstream acceptance, starting this year.

That was the message this week from automakers, government officials and utility operators at the Plug-In 2010 conference, a major international gathering of alternative vehicles at the San Jose Convention Center.

“Now the rubber hits the road”, said Craig Childers, an air resources engineer with the California Air Resources Board. “This is the last conference where we don’t have the cars. When we do this again next year, there’s going to be thousands of people driving these cars and it’s going to be great to see how that happens. We’ll learn from it and continue to evolve.”

A large amount of attention at the event went to two vehicles: the battery electric Nissan Leaf and the Chevy Volt, a plug-in hybrid. Both groundbreaking cars will begin appearing in showrooms in December.

At Tuesday’s conference, GM announced the Volt’s sticker price will be $41,000. A federal tax credit will bring the cost of the vehicle down by $7,500. The Volt also be available to lease for $350 a month for 36 months, assuming a down payment of $2,500.

GM calls the Volt an “extended-range electric vehicle,” which means that the car can go 40 miles on a single battery charge, using no gasoline. An additional 300 miles can be driven as the car uses gasoline to power an on-board generator to make more electricity and power the engine.

Tony Pasowatz, the Volt’s Vehicle Line Director, said that distance is key for getting consumers to overcome their “range anxiety” and trust that the Volt will get them where they need to go without being stranded with an empty battery.

“The Volt gives you an extended range capability that no other electric vehicle can provide you,” Pasowatz said. “So we have a good, solid confident proposition of 340 miles, whereas many electric cars will not achieve the range that they claim because their range is on a city cycle which no one drives, it doesn’t account for running the heating and air conditioning, and it doesn’t account for the degradation of the battery. And if you really only get 50 miles, the question is can that be your everyday car?”

The Nissan Leaf, an all-electric vehicle, which has a range of 100 miles on a single charge, will be made available to consumers by December in five states initially, including California.
To date, there have been 20,000 pre-orders for the Nissan Leaf, with more than 3,000 of those orders coming from prospective buyers in the Bay Area.

Mark Perry from Nissan standing next to the Leaf, an all electric-vehicle. Photo by Sheraz Sadiq

For Mark Perry, Director of Product Planning at Nissan, the consumer acceptance of the new generation of electric cars in the state resonates nation-wide. “If there was a barrier to adoption called affordability, that’s been knocked over. If there was a barrier to adoption called charging infrastructure, it’s been knocked over here in CA. There are no barriers now. The entire country is looking at California as a lead.”

The Leaf will cost $32,780, but after the federal tax credit of $7,500, and a California state rebate of $5,000 – which the Volt is not eligible for – the actual price will be $20,280. The Leaf also will be eligible for drivers to take into California’s carpool lanes without having more than one passenger, while the Volt will not.

Ginny and John Pauksta of San Jose paid $99 to reserve a Leaf. “The tipping point for me was the BP oil spill, the frustration of what we’re doing to the environment,” said John Pauksta. “It made me very angry. The fact that we’re fighting wars to protect our oil reserves just got to me. Electric cars were like toys, like glorified golf cars and now major car companies are coming out with electric cars that look like real cars.”

“You can fit five people in it and haul stuff around and the driving range is within a level of tolerance”, added Pauksta, who commutes 44 miles daily to his job in Palo Alto.

Instead of the lead acid and nickel-metal hydride batteries that powered the first generation of electric cars like GM’s EV1 in the 1990s, today’s electric car batteries are made of lithium-ion cells, which are now small enough that they can be easily assembled into battery packs and charged using a simple 120-volt outlet, as Pasowatz did with his Chevy Volt, charging it overnight at the conference center.

With the purchase of a Volt, consumers will get a 120-volt portable charge cord set and the option of GM’s 240-volt cord set, which would cut the charging of the vehicle in half, from eight hours to four hours.

Apart from the advancements in battery technology, a perfect storm of factors seems to brewing to usher in a new, more hospitable climate for electric cars, experts at the event, which runs through Thursday, said.

“The technology is moving ahead. The recognition of getting off of oil is important and I think the car is part of the larger energy environment ecosystem, it’s come to that realization that it is time to solve these problems in a systemic way”, said Pasowatz.

According to the Air Resources Board, there are roughly 20,000 pure electric vehicles in California, including roughly 15,000 small neighborhood electric vehicles that aren’t designed to drive on highways.

Utilities, regulatory agencies and environmental organizations expect those numbers to rise as long as gas prices continue to be high, which makes electricity as a fuel source a particularly attractive option.

“Gasoline is about $3, plus or minus, per gallon,” said Sunil Chhaya, a senior manager at the Electric Power Research Institute in Palo Alto. ”Electricity is about 75 cents per gallon, so when you compare operating costs per mile, it’s about a fourth or a fifth the cost of gasoline.”

As the economy improves and worldwide demand for oil grows, gasoline prices may not stay at the current level.

“We’re not sure what gasoline prices are going to look like in the next five to 10 years and it’s widely expected that those will get on an upward trajectory again and start climbing up and beyond four a gallon,” said Childers. “In that case, we’re talking about a very big price difference for electricity. We actually need that because these electric cars are more expensive to build and buy and the only way consumers can afford it is by saving money on fuel."

Moreover, California’s grid, with its mix of hydroelectric power, nuclear power and renewables like solar and wind power, is also cleaner than the nation’s grid — which relies more heavily on power from coal-fired plants. So environmental benefits accrue when drivers plug-in to the grid to charge their vehicles. Chhaya said that “50 to 60 percent of the CO2 emissions can be reduced by using a battery electric vehicle plugged into the state’s grid.”

Still, a big factor for consumers is the sticker price of electric cars. Palo Alto-based Tesla motors offers currently only one electric vehicle line, its sporty Roadster that retails for more than $100,000.

Availability of public charging stations has also been a challenge.

Earlier this year, however, Campbell-based Coulomb Technologies received a $37 million grant from the U.S. Department of Energy to build 4,600 charging stations in nine metro areas, including San Francisco, San Jose, Sacramento and Los Angeles by September 2011. The charging stations will also feature a new connecting standard adopted in January by the Society of Automotive Engineers so that any electric car can be charged at the charging stations.

For consumers like Kadife Besir-Dunlap, a schoolteacher from Woodland, neither the Chevy Volt nor the Nissan Leaf can compare to her beloved EV1 which was reclaimed by GM in 2002 when her two-year lease expired and GM refused to renew the lease for her or other EV1 owners.

“The Volt is a plug-in, it’s not full electric,” she said. “The car of the future is powered by the fuels of Jurassic time. My frustration is renewed right now. GM could have produced another electric vehicle. They had the technology and a really nice car with the EV1 and they could have reproduced something like that, a more affordable full electric car. A hybrid car is not progress, it’s stagnation.”

Since the tow truck took away her family’s EV1, Besir-Dunlap has been driving an all-electric Toyota RAV4. Earlier this month, under a partnership with Tesla Motors, Toyota announced plans to start production up again on the all-electric RAV4 in 2012 at the NUMMI auto plant in Fremont.

Still, some people at the conference couldn’t wait to plug-in and drive.

“I see nothing but increases in gas prices so I want to get out of the polluting, expensive internal combustion world and into the less expensive, less polluting world of electric vehicles,” said Jared Alaqua, a 28 year-old Novato resident pursuing his M.B.A. “And I hear that they actually perform better.”

Check out these QUEST resources for related information:

Waiting for the Electric Car

Plug-in Hybrids

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The Tesla Roadster is an all-electric sports car you can buy today.

Plug-in hybrids run for a certain distance on batteries (so far, hackers have been able to create plug-in hybrids that run for about 10 miles on batteries). After that, they revert to standard hybrid operation, which uses gas and electricity. When you get home in the evening, you plug the car in and recharge the batteries so that the following day you can drive another 10 miles with the electric charge.

Today you can only get a plug-in hybrid by hacking your Prius to add more batteries to it. We filmed members of the Palo Alto nonprofit CalCars doing just this for our QUEST story on plug-in hybrids in 2007. If you're not handy with tools, you can have someone else retrofit your Prius with the necessary battery pack. Luscious Garage, in San Francisco, has started offering this service. They're featured in today’s QUEST story "Waiting for the Electric Car," which explores why all-electric everyday cars remain an elusive goal. The limiting factor is the difficulty in making a battery that is powerful, long-lasting and cheap. QUEST goes behind the scenes to a battery lab at the Lawrence Berkeley National Laboratory in Berkeley to find out what goes into the making of a lithium-ion battery and why it’s taking so long to make one that can power an all-electric car, or even a plug-in hybrid that can go for more than 10 miles on its electric charge.

Watch the Waiting for the Electric Car television story online.

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