Recycling for the Future: Scientists Create Enzyme Formula to Break Down Plastics

Our human habit of excessive plastic consumption has degraded the environment, and we have yet to find a solution to undo the damage. However, scientists have paved the way for a much speedier resolution with a new enzyme formula. 

Scientists have crafted a formula of two plastic-munching enzymes, PETase and MHETase, to rapidly break down plastic waste. The PETase enzyme has been previously used to break down plastics, and now when combined with MHETase, this duo can dissolve plastics six times faster. 

PETase, as its name implies, is the enzyme that dissolves polyethylene terephthalate (PET), a thermoplastic polymer commonly used in plastic bottles and clothing. The polymer PET takes hundreds of years to break down, but with PETase, the process is reduced to mere days. 

However, the rate at which PET is produced has proven to be far too mighty for the rate at which PETase can break plastics down.

So far, researchers have only found a way to break down plastic bottles, which account for just over 4% of all of the PET production that exists. Ecologists find this minuscule number frightening, as many of Earth’s limited resources are being pushed to the brink while a shift to regular recycling has been quite limited. Scientists are also highly concerned with PET’s active role in accelerating climate change. The copious amounts of greenhouse gases that are spit into the atmosphere during PET production grows more concerning as PET usage rapidly increases. PET is a sturdy material that is not broken down well by microbial organisms, so other potential solutions have failed to effectively break down the impenetrable product. The downside to current popular methods of breaking down plastics is the high amount of energy required; in turn, this becomes an incredibly costly process.

Now, an innovative team consisting of American and British scientists has found a way to create a “super-enzyme.” The MHETase enzyme was studied using the Diamond Light Source, a powerful X-ray beam that is 10 billion times brighter than the sun, to study the atoms of MHETase. They have engineered a way to connect PETase with its sibling enzyme MHETase, which has now tripled the speed of the breakdown process. Their preliminary experiments tested the ability of the enzymes to work together, but as two separate enzymes. Then, they physically connected the two enzymes, and found that the two work better attached. This new enzyme deconstructs plastics in two steps. First, PETase eats away at the surface of the plastic. Then, MHETase slices up the rest. 

Researchers are hoping that providing a commercially sustainable method for plastic deconstruction will shift people away from depleting Earth’s oil and gas resources. The discovery of the super-enzyme formula certainly holds hope for preserving the world’s ecology, if only humans learn to change destructive consuming habits for the better.

Ella Nguyen

is an undergraduate student at Vassar College pursuing a degree in Hispanic Studies. She wants to assist in the field of immigration law and hopes to utilize Spanish in her future projects. In her free time she enjoys cooking, writing poetry, and learning about cosmetics.

10 Travel Destinations Paving the Way in Sustainability

According to the United Nations, the global community must take drastic measures to alleviate the climate crisis. The Intergovernmental Panel on Climate Change, composed of nearly 1,300 scientists, predicts that global warming could increase worldwide temperatures up to 2.7 degrees Fahrenheit by 2040. This temperature rise will almost certainly exacerbate food insecurity, disease transmission, sea level rise and loss of ecosystems. From 2009 to 2013, international travel alone accounted for 8% of global greenhouse gas emissions. Roughly 1.4 billion people travel to a new destination each year, indirectly contributing to air pollution, land degradation and strained resources. These current levels of travel threaten the Paris Agreement, which proposes an annual 7.6% decrease in greenhouse gas emissions. Many countries have recognized the importance of environmental management and have striven for sustainability. From Malta to Japan, travel destinations are implementing eco-friendly practices, such as renewable energy and wildlife conservation. Travelers to these locations can explore pristine environments while positively impacting the planet. 

1. Gozo, Malta

The coastline of Gozo, Malta. Zoltan Tasi. Unsplash.

Located in the Mediterranean Sea, the island of Gozo boasts a rich historical identity. Recognized by UNESCO, the Ggantija Temples are the world’s oldest free-standing structures, predating Stonehenge and the pyramids of Egypt. In addition to these historical sites, the island is relatively undeveloped, offering scenic hills and untouched coastlines. The European Environment Agency regularly monitors urban waste and pollution in coastal areas. According to their assessment, Maltese beaches rank among the cleanest in Europe. Within this pristine environment, common activities include swimming, snorkeling, deep-sea diving and kayaking. Gozo also hosts 85 endemic species of flora and fauna. To protect and preserve this unique landscape, the Ministry for Gozo established the Eco-Gozo Regional Development Directorate in 2009. Over the past decade, the island has become a model for sustainable development. Through renewable energy, green transportation and plastic reduction, Gozo is committed to reducing its carbon and water footprints. Ecologists have established protected spaces for endangered species, while local craftsmen sustainably restore ancient ruins like the Ggantija Temples. To further improve the standard of living in the Gozitan community, the island implements eco-education programs in schools and offers locally sourced, organic ingredients in restaurants. Named the Mediterranean’s Best Green Destination in 2018, this small island continues to gain recognition for its innovative conservation efforts.   

2. Ljubljana, Slovenia

The Ljubljanica River, a pure water source in central Slovenia. Pedro Szekely. CC BY-SA 2.0

Known as “Slovenia’s Green City,” Ljubljana is the first European capital to establish a “zero-waste” initiative. The city currently recycles nearly 70% of its waste, reducing landfill trash to a mere 5%. Residual waste is processed into recyclable materials, solid fuels and high-quality gardening compost. Public green spaces, which include thousands of trees, comprise a third of the city’s territory and absorb carbon dioxide from the atmosphere. Visitors to Ljubljana can explore a variety of hiking trails, as well as an urban bee path that cares for 4,500 beehives. The city draws from the Ljubljanica River, which provides natural, non-processed drinking water and eliminates the need for plastic bottles. Since 2007, the historic city center has banned car traffic, allowing only bikes, pedestrians and electric trains. With fewer cars, the integrity of cultural and historical landmarks, like Preseren Square and Cobblers' Bridge, will be preserved for generations. In 2016, Ljubljana was deemed the “European Green Capital” and it plans to be zero-waste by 2035.

3. Azores, Portugal

The rugged cliffs of the Azores Islands in Portugal. Yves Alarie. Unsplash.

With nine volcanic islands, the archipelago of the Azores has diverse geological significance. The islands’ landscapes are dominated by craters, lagoons, waterfalls and lava fields. Visitors can hike among dense coastal forests, relax in natural hot springs and journey through dormant volcanoes. Azorean wildlife is varied and includes whales, dolphins, seals, bats and hedgehogs. However, rising sea temperatures spurred by climate change have driven aquatic species, such as the North Atlantic right whale, to near extinction. To protect the islands’ biodiversity, the Azores Islands harbor more than 60 marine protected areas which serve as sanctuaries for endangered species. Rather than burning fossil fuels, the Azores utilize geothermal power plants to harvest renewable energy from the earth’s subsurface. Geothermal power currently provides around 50% of the islands’ energy needs. Due to these sustainable developments, the Azores ranked among the world’s top 100 sustainable destinations in 2019. 

4. Iwokrama Forest, Guyana 

The dense foliage of the Iwokrama Forest. Kunal Shinde. Unsplash.

Named “The Green Heart of Guyana,” the Iwokrama Forest is one of the last pristine tropical forests in the world. For decades, global timber industries have exploited these natural ecosystems through deforestation, generating 18% of all greenhouse gas emissions. While tropical forests only occupy 7% of the Earth’s surface, they capture and store carbon naturally, with Iwokrama capturing over 1.4 million tons of carbon dioxide annually. In order to mitigate the loss of vital vegetation, Iwokrama employs a polycyclic harvesting system, resulting in the removal of less stems per acre and no significant gaps in the forest canopy. The Forest Stewardship Council has commended these forest management practices, which prioritize locals, wildlife and the natural environment. Amid lush forests, wetlands and savannas, visitors might encounter diverse wildlife such as jaguars, giant anteaters, black caimans and harpy eagles. While traversing the Iwokrama Canopy Walkway, a 500-foot series of suspension bridges, travelers can examine nearly 6,500 species of plants. In 2016, Guyana’s Environmental Protection Agency awarded the Iwokrama Forest with the Green Award for its exemplary environmental stewardship.  

5. Galapagos National Park, Ecuador

A Galapagos sea turtle swimming off the coast. Wexor Tmg. Unsplash.

As a UNESCO World Heritage Site, the Galapagos National Park and surrounding waters are protected for conservation. The 19 islands boast distinct landscapes, ranging from barren volcanic rocks to green sand beaches formed by olivine crystals. The Galapagos are home to a variety of endemic species, including 15 mammals, 45 bird species and 79 types of fish. Due to wildlife sanctuaries and habitat restorations, vulnerable animals like tortoises, iguanas and sea lions live in harmony with humans. The Galapagos Islands also have a rich variety of endemic flora, with over 500 species discovered. When visiting the Galapagos, visitors are expected to act responsibly and treat the environment with respect. Common activities include snorkeling alongside sea turtles, hiking over dried lava beds and whale watching from kayaks. The Galapagos National Park is well maintained and protected by park rangers and volunteers, who partake in regular coastal cleanups. However, to ensure long-term sustainability, the islands offer outreach and education programs. Ecologists and environmental experts teach locals and visitors about the harmful effects of climate change and pollution in the hopes that this diverse landscape will endure for years to come. 

6. Felicite Island, Seychelles 

Felicite Island in the early morning. Nenad Radojčić. Unsplash.

Located in the Indian Ocean, Felicite Island contains parts of Ramos National Park and multiple marine protected areas. This small island community has multiple initiatives to conserve energy and invites visitors to share the responsibility of offsetting their carbon footprint. Drip irrigation has been introduced as a solution to water and energy waste. Widespread rainwater harvesting allows the use of rainwater for non-potable needs, such as washing clothes and watering gardens. Organic vegetable gardens support the ultimate aim of self-sustained food and beverages in the Seychelles. Special efforts are given to waste reduction, with zero-waste and plastic-free initiatives. Recently, island officials banned plastic bags, plates, cups and plastic foam boxes in order to mitigate ocean pollution. Additional conservation programs include a reforestation project, sea turtle monitoring and coral restoration. Within this pristine paradise, visitors can partake in snorkeling, diving and community outreach programs regarding climate change. 

7. Serengeti National Park, Tanzania

Elephants, an endangered species, graze the Serengeti. Hu Chen. Unsplash.

Founded in 1951, Serengeti National Park houses one the highest concentrations of mammals in Africa, with species such as lions, giraffes and hippos. It is also known for the largest remaining unaltered animal migration in the world, with over 6 million zebras, gazelles and wildebeests stampeding over the fertile plains. At least four globally threatened or endangered species, such as elephants and cheetahs, thrive in these heavily-patrolled conservation areas. Guided safaris allow visitors to witness this diverse wildlife from a close proximity. Serengeti, however, is committed to sustainable visitation in order to protect the environment from irreversible damage. Human activity and waste disposal are closely monitored by park rangers. Conservation areas and secure breeding grounds also mitigate the impacts of deforestation, poaching and urbanization. Through such practices, Serengeti National Park allows wildlife to roam freely in their natural habitat, an increasingly rare commodity. 

8. Republic of Palau

Coral reefs, an endangered ecosystem. Qui Nguyen. Unsplash.

Located in the western Pacific Ocean, the Republic of Palau includes over 200 volcanic and coral islands. Palau supports a diverse aquatic environment, inhabited by nearly 700 coral species and 1,400 fish species. Coral reefs protect coastlines from waves, provide wildlife with refuge and offer opportunities for recreation. Due to climate change, this vital ecosystem is severely threatened. The Coral Reef Research Foundation promotes water conservation, renewable energy and recycling to mitigate coral destruction. In 2018, Palau banned sunscreens that contain environmental pollutants and established marine sanctuaries in 80% of its territorial waters. Travelers to Palau must sign a pledge declaring that they will preserve and protect the island. While scuba diving, snorkeling and surfing, visitors must adhere to this pledge and respect wildlife. 

9. Sun Moon Lake, Taiwan

Sun Moon Lake at sunset. Eddy Tsai. CC BY-SA 2.0

Residing in the foothills of Taiwan’s Central Mountain Range, Sun Moon Lake prides itself on maintaining a low carbon footprint. Public transportation routes have decreased the reliance on driving, thereby reducing the emission of greenhouse gases. Cable car systems, electric boats and cycling paths are common alternatives to cars at Sun Moon Lake. This rural region also hosts a range of dams which generate 62% of Taiwan's total hydroelectricity. Travelers to Sun Moon Lake can hike through dense forests, kayak in turquoise waters and interact with Indigenous people who live in the area. Thao natives, such as the Bunun, believe humans and Earth are intrinsically connected, opting to practice sustainable farming and fishing. Sun Moon Lake adheres to this philosophy and strives to protect the fragile environment. 

10. Kamaishi, Japan 

A traditional Japanese torii. Tianshu Liu. Unsplash.

Along the rugged Sanriku Coast, Kamaishi is an important fishing and industrial city. In 2011, a 45-foot tsunami swept through the city, devastating the local fishing industry and taking the lives of roughly 1,000 people. Amid ongoing reconstruction efforts, Kamaishi is prioritizing sustainability. Established two years after the tsunami, the Sanriku Fukko National Park consists of towering cliffs, unique stone formations and isolated coastlines. The Jodogahama and Kirikiri beaches, surrounded by vibrant green pine trees, host diverse marine ecosystems. Salmon, scallops, crabs and sea urchins are among the many aquatic animals that receive protections from overfishing. Through coastal cleanups, inland forestry conservation and river purification, Kamaishi strives to reduce the impact of industrial pollution. Forms of public transportation, such as electric trains and ride-shares, further mitigate car traffic and fossil fuels. Kamaishi is also a leader in renewable energy, relying on solar power and biomass fuel to power residential areas. Environmental organizations have commended Kamaishi for rebuilding a cleaner community in the wake of such a devastating natural disaster.

Shannon Moran

is a Journalism major at the University of Georgia, minoring in English and Spanish. As a fluent Spanish speaker, she is passionate about languages, cultural immersion, and human rights activism. She has visited seven countries and thirty states and hopes to continue traveling the world in pursuit of compelling stories.