Global warming is here, but that doesn’t mean we have to sit around and watch the dire consequences come to pass. Innovators around the world are finding solutions for curbing carbon emission. Here’s our list of some of the most promising efforts under way.
1. Concrete Steps
Idea: Capture carbon from power plant flue gas and convert it into usable calcium carbonate. In a process that mimics the way marine organisms make their shells, CO2 mineralizes into a solid form as strong and sturdy as regular commercial cement.
Why It Just Might Work: Most sequestration projects lock CO2 away deep underground in rock formations. This approach, by a company named Calera, uses a byproduct to make a much-needed substance. The carbon-negative cement facility attaches to power stations, an arrangement that benefits energy companies looking to comply with emissions caps.
Why It Might Not: Making the carbonate you need requires a source of calcium and alkalinity, such as waste metal oxides. Transporting the liquid is a bear, so the technology is limited to being employed near industrial facilities that have metal oxide waste streams.
Climate Factor: Making one ton of regular cement emits nearly a ton of CO2. Carbonate cement, on the other hand, is carbon negative: It sequesters .44 tons of CO2 per ton of product.
Show Me the Money: Initial expenses aside—the first facility had a price tag of $20 million, funded with a Department of Energy grant—the synthetic carbonate cement will cost the same as the standard variety, Calera claims.
Time Horizon: Calera has one plant up and running and one in the works for a September 2014 launch, and hopes to build a third, in China, in 2015. A mix of Calera’s product and traditional cement has been used in construction projects since 2012, and fiber cement board should hit the market later this year.
If all concrete were Calera concrete, it would offset the emissions of: Poland.
2. Greener Pastures
The Idea: Fertilize grasslands with composted cow manure and plant waste. The Marin Carbon Project wants farmers to apply the organic mix to their pastures to vastly increase their ability to act as carbon sinks.
Why It Might Work: By composting cow manure in giant digesters, farmers can keep the smelly stuff from emitting methane—a greenhouse gas 30 times more potent than CO2. Processing manure is also getting cheaper, with more and more cash available to farmers from state governments to subsidize the necessary equipment. Plus, adding the compost to grasslands spurs the growth of plants, which naturally sequester atmospheric carbon.
Why It Might Not: Motivating farmers to shoulder the expense could prove a considerable challenge. And some compost mixes work better than others; the Marin Carbon Project is studying different recipes to optimize the carbon sequestration effects. Right now most of the compost comes from a single private retailer.
Climate Factor: A half-inch layer of compost sequesters a metric ton of CO2 per hectare, per year. Just one application enhances carbon sequestration for three years. Slathering just 5 percent of California’s rangelands with compost would offset 28 million metric tons of CO2 per year, more than the emissions of the state’s entire agricultural sector.
Show Me the Money: The Marin Carbon Project received $75,000 from the USDA to beef up its operations, with other funding streaming in from Marin County and several philanthropic organizations.
Time Horizon: Three farms in the Bay Area are testing a compost program. They’re tracking costs and equipment needs over 100 acres of treated land. No specific timeline for the future exists just yet.
If all rangeland in the US were covered, it would offset the emissions of: Canada.
3. Air Force
The Idea: Fly giant helium blimps that convert wind into electricity. Buoyant Air Turbines, or BATs, are roughly the size of shipping containers, hover at up to 1,000 feet, and are tethered to the ground with large, conductive cables.
Why It Just Might Work: BATs, developed byAltaeros, have several advantages over traditional turbines. They have significantly smaller carbon footprints, since they don’t require concrete foundations or fleets of semis to transport parts. They’re mobile, so they can provide energy where needed, and they require less than 24 hours to deploy. Installation doesn’t degrade habitat, and once aloft they fly so high they pose little risk to birds; traditional turbines in the United States alone kill half a million birds a year.
Why It Might Not: BATs are vulnerable to severe weather events, which are becoming increasingly common as the planet warms. Lightning or intense rain could ground an entire farm.
Climate Factor: A single BAT can produce twice as much energy as a traditional turbine, since winds blow more consistently at higher altitudes.
Show Me the Money: Altaeros has launched a $1.3 million, 18-month pilot project south of Fairbanks, Alaska. Over the project’s lifespan, one BAT will power 12 homes at a cost of 18 cents per kilowatt-hour, half the going rate locally.
Time Horizon: Beyond the Fairbanks venture, Altaeros is planning deployments in other remote areas in the United States in 2015, and at some offshore sites by 2017.
If all wind turbines were BATs, it would offset energy consumption of: The U.S., 10 times over.
Why It Just Might Work: Worldwide more than 2 billion people, or roughly one-third of the global population, already eat insects, and companies are easing Westerners into the practice by hiding the six-legged base ingredients in energy bars, chips, and cookies. Crickets are the popular choice; one cup of cricket flour has 70 grams of protein, about as much as beef.
Why It Might Not: The ick factor is the major hurdle. Many people recoil at the thought of munching on exoskeletons. And as of yet, the FDA has not established any regulations for insects as food.
Climate Factor: Globally, agricultural is responsible for 70 percent of freshwater use and up to 29 percent of greenhouse gas emissions, and it occupies nearly half of the planet’s land surface. By 2050, says the United Nations, 70 percent more food will be needed to feed the world’s growing population. Crickets, packed with protein and other nutrients, are 12 times more efficient than cows at producing food, require substantially less water and land to raise, and create 30 grams of CO2 emissions per kilogram compared with beef’s nearly 3,000.
Show Me the Money: A chirp for your buck—it could cost as little as $1.50 to raise 1 kilo of crickets.
Time Horizon: Momentum is gathering: A raft of American startups have been bitten by the entomophagy bug, and several are already hitting the market. The first American farm to raise crickets for human consumption broke ground in Ohio in April.
If every kilo of cow meat were replaced by cricket flour, it would offset the emissions of: India.