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Powering Cars With Cactus Juice

June 24, 2019 By EarthWise Leave a Comment

Back in 2016, a company called Nopalimex, located in Micoacan, central Mexico, built the world’s first cactus-powered energy plant. The facility utilizes a biodigester to make biogas from nopal, also known as prickly pear cactus. The nopal plant has been called the ‘Green Gold of Mexico’ and is a staple in Mexican diets, medicine and cosmetics.

Nopalimex is now using the cactus to make biofuel for vehicles.

The fruit of the cactus is pureed, mixed with manure, and then left to decompose, producing methane. The methane produced – about eight tons a day – fuels the biodigester which powers the company’s corn chip and cactus chip production and is being tested in a fleet of government vehicles.

The biogas will cost just 65 cents per liter, which is about a third cheaper than the cost of regular gasoline. Using prickly pear as a feedstock for biofuel is attractive because it can be grown in places where traditional energy crops cannot. One can imagine vast fields of cacti in remote, arid areas of the country where normal crops cannot grow. It would not suck up the resources or space needed to feed people, which is an ongoing criticism of current bioenergy crops.

As long as the nopals are regularly replanted, the process is almost entirely sustainable, producing only water and nopal waste, which can be used to fertilize other crops.

Finding sustainable ways to produce fuel while doing minimal damage to the environment is an important challenge for countries around the world. In Mexico, harnessing the power of the prickly pear cactus is a unique and clever solution.

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Mexico’s ‘green gold’: The company powering cars with cactus juice

Photo, posted July 8, 2006, courtesy of Christian Frausto Bernal via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Solar Equity for Low-Income Communities

May 30, 2019 By EarthWise Leave a Comment

A couple of years ago, the number of American roofs covered with solar panels passed the one million mark and the numbers keep growing. But nearly half of U.S. households – accounting for more than 154 million people – aren’t able to host their own solar arrays because they lack suitable rooftop space, or they rent their homes. But millions more simply can’t afford to spend tens of thousands of dollars to buy or lease solar panels.

In recent years, community solar has become popular. These are projects where multiple participants own or lease shares in a mid-sized solar facility and receive credits that lower their monthly utility bills. Community solar in the U.S. has more than quadrupled just since 2016.

However, the majority of community solar subscribers to date have been businesses, universities, government agencies, and higher-earning households. These users can generally pay steep project enrollment fees or meet various financial requirements. Meanwhile, those who could benefit most from access to renewable energy and lower utility bills – low-income residents – have largely been left out.

Low-income households on average spend over 8% of their income on utility bills, about three times more than moderate- to high-income households. So, reducing electricity bills with community solar power is a big deal for them.

Given this situation, there are now a growing number of programs that make use of community solar to reduce living expenses for low-income households. In a dozen states, new programs include a variety of mandates, financial incentives, and pilot programs targeting benefits for people with low incomes. These programs will allow them to participate in both the environmental and economic benefits of renewable energy.

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Energy Equity: Bringing Solar Power to Low-Income Communities

Photo, posted November 27, 2012, courtesy of Oregon State University via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

The Problem With Flaring

October 12, 2018 By EarthWise Leave a Comment

Oil and gas are typically produced together. If oil wells are located near gas pipelines, then the gas gets used. But if the wells are far offshore, or it is not economical to get the gas to market, then oil companies get rid of the gas by burning it – a process known as flaring.

Trends Influencing Our Cities

February 23, 2018 By EarthWise Leave a Comment

The Environmental Protection Agency removed its information hub about climate change last year. In response, 17 cities reposted the information on their own city government sites. This is indicative of the fact that cities are increasingly taking on a leadership role in environmental, social and economic change.

A Solar-Powered Vertical Farm

November 21, 2017 By EarthWise Leave a Comment

Vertical farming is a method for producing crops in vertically stacked layers or surfaces typically in a skyscraper, used warehouse, or shipping container. Modern vertical farming uses indoor farming techniques and controlled-environment agriculture technology.

Satellites And Conservation Science

August 3, 2017 By EarthWise

Satellites orbiting the earth are becoming an increasingly powerful tool for counting and monitoring wildlife populations and to answer a host of other questions about the natural world.

Arguing Against Climate Change

April 3, 2017 By EarthWise

Most of the world has accepted the analysis of the overwhelming majority of climate scientists that shows that our planet is warming and that our actions are the primary cause. However, some people – notably a number holding high office – reject this analysis. What exactly does it imply to say that climate change is not happening or is not caused by us?