limited

Fuel From Wind And Water | Earth Wise

February 21, 2023 By EarthWise 1 Comment

Hydrogen is the most common element in the universe and it can be used as a fuel to run cars, trains, and even airplanes. Using it produces no harmful emissions. However, to date, the way it is economically produced is not clean and green. It is made from natural gas and leaves behind lots of carbon dioxide.

Around the world there are many projects working on so-called green hydrogen. Producing hydrogen by splitting water into its component elements is called electrolysis and produces only oxygen as a waste product. The problem with electrolysis is that it takes prodigious amounts of energy and therefore is very expensive.

A new project taking place in north Texas hopes to create the country’s first large-scale producer of green hydrogen. The project is building a 900-megawatt wind farm along with a 500-megawatt solar farm. The 1.4 gigawatts of total production capacity is more energy than the city of Austin consumes. That energy will be used to produce 200,000 kilograms of hydrogen a day.

This project is among the largest proposed green hydrogen projects in the U.S. There are green hydrogen proposals in Europe, Australia, Africa, and the Middle East that range from 10 GW to 67 GW.

The Texas project, being developed in partnership by Air Products and AES, has been enabled by government support from the Inflation Reduction Act.

There are a few thousand hydrogen-powered cars, boats, and trains but without substantial, cost-effective hydrogen infrastructure, the market is very limited. Subsidizing the development of the necessary infrastructure is essential if there is any real chance to create the long-imagined hydrogen economy.

**********

Web Links

Texas Project Will Use Wind to Make Fuel Out of Water

Photo, posted June 5, 2005, courtesy of City Transport Info via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Carbon Capture: Solution Or Band-Aid? | Earth Wise

July 13, 2022 By EarthWise Leave a Comment

The idea of capturing the CO2 emissions from industry and locking them up is nothing new. It’s been going on for decades in some places. Norway’s state-owned oil company Equinor has been holing away a million tons of CO2 a year for a long time. But overall, CCS – carbon capture and storage – has had very limited use. As of last year, there were only about 30 large-scale projects in operation around the world, capturing only 0.1% of global emissions.

There is now growing interest in CCS and many new projects are underway. A combination of rising carbon prices in Europe, tax breaks for CCS in the US, national net-zero targets, and the increasing need to ramp down global emissions are all driving rising CCS activities.

While recent reports from the Intergovernmental Panel on Climate change still claim that it is possible to remain below 2 degrees Celsius of warming without using carbon capture, there is growing belief that it may be necessary given the present pace of the transition away from fossil fuels.

Two industries that together produce about 14% of global CO2 emissions are cement and steel. These are both industries for which it is difficult to eliminate emissions regardless of the energy sources used. CCS may be the best approach to reducing their emissions.

But there is considerable pushback against CCS. The concern is that CCS is primarily a way to delay decarbonization. It encourages various industries to continue to use fossil fuels instead of shifting away from them. Nonetheless, CCS no doubt has its place as part of the solution to climate change.

**********

Web Links

Solution or Band-Aid? Carbon Capture Projects Are Moving Ahead

Photo, posted June 5, 2022, courtesy of Mark Dixon via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Wind Farms Slowing Each Other Down | Earth Wise

July 13, 2021 By EarthWise Leave a Comment

Offshore wind is booming in Europe. The expansion of wind energy in the German Bight and Baltic Sea has been especially dramatic. At this point, there are about 8 gigawatts of wind turbines in German waters, the equivalent of about 8 nuclear power plants. But space in this region is limited so that wind farms are sometimes built very close to one another.

A team of researchers from the Helmholtz Center Hereon, a major German research institute, has found that wind speeds downstream from large windfarms are significantly slowed down. In a study published in the journal Nature Scientific Reports, they found that this braking effect can result in astonishingly large-scale lowering of wind speeds.

On average, the regions of lowered wind can extend 20-30 miles and, under certain weather conditions, can even extend up to 60 miles. As a result, the output of a neighboring wind farm located within this distance can be reduced by 20 to 25 percent.

These wake effects are weather dependent. During stable weather conditions, which are typically the case in the spring in German waters, the effects can be especially large. During stormy times, such as in November and December, the atmosphere is so mixed that the wind farm wake effects are relatively small.

Based on their modeling, it is clear that if wind farms are planned to be located close together, these wake effects need to be taken into account. The researchers next want to investigate the effects that reduced wind speeds have on life in the sea. Ocean winds affect salt and oxygen content, temperatures, and nutrients in the water. It is important to find out how reduced winds might affect marine ecosystems.

**********

Web Links

Are wind farms slowing each other down?

Photo, posted November 23, 2011, courtesy of David J Laporte via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Why Have Crocodiles Changed So Little Over Time? | Earth Wise

February 9, 2021 By EarthWise Leave a Comment

Crocodiles today look very similar to ones from the Jurassic period some 200 million years ago. In fact, there are very few species of crocodilians alive today – approximately two dozen to be exact. Many other species have achieved a diversity of many thousands of species in the same amount of time.

During prehistoric times, many more types of crocodiles roamed the earth, including some as big as dinosaurs and other serpentine forms that lived in the sea.

According to findings by scientists at the University of Bristol in the U.K., a stop-start pattern of evolution could explain why crocodiles have changed so little over time. In the study, which was recently published in the journal Nature Communications Biology, researchers describe how crocodiles follow a pattern of evolution known as “punctuated equilibrium.” In other words, crocodiles’ rate of evolution is generally slow, but occasionally picks up because the environment has changed.

According to the research team, this slow rate of evolution is how crocodile diversity became so limited. It appears crocodiles arrived at a body that was efficient and versatile. They didn’t need to continue to change in order to survive.

This efficiency and versatility could be an explanation for why crocodiles survived the meteor impact that wiped out the dinosaurs. Since crocodiles can’t control their body temperature and rely on the environment for warmth, they generally fare better in warm conditions. During the age of dinosaurs, the climate was warmer than it is today, which could explain why crocodile diversity was higher.

The scientists next step is to try to figure out why some prehistoric crocodiles died out while others did not.

**********

Web Links

Why crocodiles have changed so little since the age of the dinosaurs

Photo, posted December 26, 2012, courtesy of Nicholas Smith via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.