She Sells Seashells (and Energy?) by the Seashore

By: Jessica Robertson

The power of the ocean is undeniable. With new technology, that power could be harnessed in such a way that seashells and seafood won’t be our greatest export from the watery giant for much longer.

Renewable energy falls into the top-priority category among global sustainability issues; the more avenues we have for garnering clean, renewable energy, the better for our planet. The ocean is full of frighteningly powerful, high-energy water, and turning that power into electricity would be emission-free, and genius. Good thing the plans, though in their infancy, are underway!

Some of the biggest names in the energy industry are teaming up to turn these ideas into reality. Lockheed Martin, Scottish PowerRenewables, MeyGen, UC Berkeley, and the US Navy are just a few of the familiar names on these impressive projects. Five types of power-generating machines are under testing, either in the lab or in the open seas, currently.

Two of the projects, particularly, are standouts. The largest wave energy project, already in the water off the coasts of Australia, consists of special buoys anchored to the ocean floor; as waves roll, the buoy moves with the wave and the anchor stays intact, causing the tension to power a hydraulic pump. The energy moves through wires to the coast, where it is stored; one single buoy’s energy can power an astounding maximum of 10,000 homes. While that number is staggering, the most effective prototype, it seems, is known as the magic carpet. Intended to be placed off the coast of California, on the sea floor, the giant mats absorb the energy that is normally dissipated into the sand on the bottom of the ocean. Careful placement of the mats, avoiding coral reefs and other marine habitats, could also create “safe zones” to protect harbors during wild storms and prevent erosion due to their ability to absorb up to 90% of waves’ energy.  Just a one square-meter patch of the mat creates enough power for two homes. Open-ocean trials are scheduled to begin in April 2016.

One familiar approach, designed similarly to wind turbines, underwater turbines rely on the tidal pull of the water rather than waves, turning the arms of the machine and creating a steady source of energy. Water turbines, though, present a significant threat to marine life that may be hurt by the many moving mechanical parts; efforts are being made to prevent any collateral damage to the environment. Another proposal, called the Sea Serpent, is at work floating off the coasts of Scotland, where jointed segments flex along with the movement of the waves to power hydraulic pumps and store energy that is delivered to the shore by underwater cables.

All the models must be designed to survive the ferocious storms that the ocean can deliver, and the fifth model banks on its simplicity to survive. As the low profile machine floats atop the water, it funnels high-pressure water through a pump to shore, where the majority of the machinery remains to convert the water pressure into electricity. This design has already proven itself in its two-and-a-half-year lifetime working on the seas.

Each of the projects has its challenges, but the real vision of clean and renewable energy helps overcome the hurdles that arise with the advent of new technology. 

Making Rice Sustainable

By: Jessica Robertson

Perhaps the most urgent of challenges arising from climate change is making agriculture sustainable. In coming years, edible resources will be more important than ever with the growing world population. One of the main staples worldwide is rice, and, at the 3^rd annual LEGATO Conference (Land-use Intensity and Ecological Engineering – Assessment Tools for Risks and Opportunities in Irrigated Rice Based Production Systems), questions were addressed regarding sustainability, productivity, and diversification in the Southeast Asia rice ecosystems.

            One of the most discussed subjects at this year’s conference was the use of silicon (Si) as an enhancement for rice plants, being able to strengthen the plants, improve their immunity to disease and ability to utilize fertilizers, and block the uptake of toxic metal. In case studies from the Philippines, where levels of Si in the soil are higher compared to soil in Vietnam, these beneficial characteristics were observed. Farmers who burn rice straw and apply the ash to the field typically find higher Si levels in their soil, while farmers who export the ash do not reap the benefits of silicon-rich soil. Educating farmers about the benefits of silicon and methods of introducing it to their crops could help increase the sustainability of the rice industry.

            The conference group also discussed topics like natural pest control, biodiversity, education in restoration of landscape biodiversity through entertainment, and the abuse of pesticides.

            However, one crucial topic that was not addressed at this year’s conference was water conservation. Water conservation is one challenge that remains higher in importance than sustainable agriculture in the face of today’s environmental issues. On average, it takes 2,500 liters of water to produce just 1 kilogram of rice. With rice being one of the world’s most popular staples, in order to increase its sustainability, the water use issue must be addressed. Hopefully, that will be one topic on the list for next year’s LEGATO conference. Until then, hopefully these proposed changes will be jumpstarting sustainability in the rice fields of the world. 

Up with Good Food, Down with Bad Livestock Practices

By: Jessica Robertson

A team of scholars at the University of Bristol’s School of Veterinary Science has begun to address the challenge of making ruminant livestock a sustainable part of the planet’s food supply. The challenge holds more difficulties than may first come to mind; with a growing worldwide population, a changing climate, and an astounding one in seven people malnourished across the world, the environmental and economic costs of current livestock-keeping practices are far too high. Ruminant livestock are a major contributor to total methane gas production annually, which is a strain on the environment; and, overall, they do not serve as a high quantity food producer, making them a poor choice for feeding a growing population. Honestly, current livestock practices end up taking more from the food supply and environment than they give. The academics offer eight strategies for improving the current practices to a more sustainable level and to boost the quality and quantity of overall food production. 
• Keep human food for humans.
As of today, livestock consume about one-third of global cereal grain while that grain could act as a resource to feed people directly. Ruminant livestock can digest foods like hay that humans cannot digest, suggesting a more resourceful and efficient alternative.
• Raise animals in their appropriate region.
Local breeds of livestock are appropriately adapted to their environment, translating into their optimal yields of milk. Costs and disease increase dramatically in breeds that are relocated, and their productivity declines proportionally.
• Prevent animal disease.
Animal disease is a huge human concern; approximately 2.2 million people die annually from zoonosis (diseases that can be transferred from animals to humans). Assuring healthy animals by improving hygiene and surveillance can help control disease.
• Implement appropriate supplements.
Using supplements to encourage the bacteria in the digestive systems of livestock can increase the animals’ nutrition and decrease their production of methane.
• Keep quality above quantity.
Milk and meat may seem greedy options when considering how to provide food for a world population. However, including these animal products into a balanced diet in undernourished populations is a health benefit.
• Fit practices to culture.
Nearly one-seventh of the world relies on livestock for their daily needs. Supplying not only food, but also wealth, status, dowry payments, livestock cannot always simply be replaced with industrial systems.
• Record costs and benefits.
Even though livestock contribute to greenhouse gas accumulation, they can also contribute to biodiversity, a healthy ecosystem, and improved carbon capture by plants and soil due to their fertilization capabilities when grazing is managed sustainability.
• Study best practice.
Research farms, a global network of them, purpose to evaluate the advantages of certain farming practices for the environment and economy. They are designed to serve as an example of responsible farming practice for both farmers and policymakers.
With these informative and thorough suggestions, hopefully sustainable changes can help make world hunger a thing of the past.