Repentance, reflection and self-discipline are supposed to be observed during Lent, which symbolizes the 40 days Jesus spent in the desert and resisted Satan’s temptations, as described in the Bible.

A green Lent could mean “thinking about the environment and doing things to save it for yourself and those who come after us,” said White-Hassler, whose church possesses the mind-set year-round. Since the summer, Grace Episcopal has been undergoing eco-friendly renovations and is considering solar panels.

The practice of a carbon fast for Lent has been talked about in Christian circles since at least 2008, when the Church of England suggested shrinking one’s carbon footprint and provided a list of 40 green actions, one for each day of Lent. (”Day one, Ash Wednesday: Remove one lightbulb and live without it for the next 40 days.”)

The call was part of a global effort with Tearfund, a Christian relief agency, to help drought-ridden, impoverished communities that already suffer from the effects of climate change.

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An easy way to get carbon dioxide out of the atmosphere is to find a chemical that combines easily with it, similar to the way that some metals oxidize. For example, compounds involving copper will usually combine with oxygen in the atmosphere voluntarily without catalysts, covering the surface of the copper material with a green patina, like the Statue of Liberty.

Unlike oxygen, carbon dioxide cannot combine so easily with other materials. It is possible to remove one electron from the molecule to facilitate its integration into other molecules, but that removal requires an electric potential of -1.97 volts, which is unreasonably high for the purpose of processing a single molecule.

One group of scientists found a certain dinuclear copper (I) complex that turns green when exposed to air under a slight electric potential (-0.03 volts). At first, they assumed it was from the exposure to oxygen, but upon closer inspection they learned that this particular form of copper was reacting with carbon dioxide.

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Two researchers from Victoria University have published a new book Time to Eat the Dog: The real guide to sustainable living. In that book they compared how much carbon a pet produces compared to automobiles and they conclude that it’s best to keep pets that you plan on eating (if you don’t eat meat then I guess you can keep being awesome).

In a study published in New Scientist, they calculated a medium dog eats 164 kilograms of meat and 95kg of cereals every year. It takes 43.3 square metres of land to produce 1kg of chicken a year. This means it takes 0.84 hectares to feed Fido.

They compared this with the footprint of a Toyota Land Cruiser, driven 10,000km a year, which uses 55.1 gigajoules (the energy used to build and fuel it). One hectare of land can produce 135 gigajoules a year, which means the vehicle’s eco-footprint is 0.41ha – less than half of the dog’s.

They found cats have an eco-footprint of 0.15ha – slightly less than a Volkswagen Golf. Hamsters have a footprint of 0.014ha – keeping two of them is equivalent to owning a plasma TV.

Professor Vale says the title of the book is meant to shock, but the couple, who do not have a cat or dog, believe the reintroduction of non-carnivorous pets into urban areas would help slow down global warming.

“The title of the book is a little bit of a shock tactic, I think, but though we are not advocating eating anyone’s pet cat or dog there is certainly some truth in the fact that if we have edible pets like chickens for their eggs and meat, and rabbits and pigs, we will be compensating for the impact of other things on our environment.”

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The BBC can tell you a bit more about the plan.

Mr Benn said: “Soil is one of the building blocks of life. Good quality soils are essential for a thriving farming industry, a sustainable food supply, and a healthy environment.
“Britain’s soils hold more carbon than all the trees in Europe’s forests – and their protection is critical if we are to successfully combat climate change.
“This is an important step in increasing the value we place on soil, and will safeguard this vital resource now and in the future.”
A Department for Environment, Food and Rural Affairs (Defra) spokesman said: “England’s soil has suffered over the last 200 years from the impacts of intensive farming and industrial pollution, and today is under threat from erosion by wind and rain, a loss of organic matter and nutrients, and pressure for development.”

What this means for the future of music piracy? Well I think yet again we may find that piracy is surprisingly green.

That scenario involves a customer buying a CD online and having it delivered via a light-duty truck; the more carbon-intensive options examined by the study are express air shipment of the CD, and the customer visiting a store to buy the CD.

The advantage for digital comes largely because CDs must be manufactured, packaged and transported over long distances.

Even in a situation in which a consumer downloads the music — and then burns it onto a CD and puts it in a CD case — the carbon differential is 40 percent in favor of the download, the study found. If the downloaded music is not burned onto a CD, the differential rises to 80 percent.

When it comes to climate change pollutants, Toronto residents are among the greenest in Canada, says a new study.

The report, published in the April issue of the journal Environment and Urbanization, says metropolises, commonly denigrated as big, dirty places, are in fact spewing fewer greenhouse gases per capita than the rest of their countries.

“Blaming cities for climate change is far too simplistic,” said author David Dodman, a researcher at the International Institute for Environment and Development in London, England. “There are a lot of economies of scale associated with energy use in cities. If you’re an urban dweller, particularly in an affluent country like Canada or the U.K., you’re likely to be more efficient in your use of heating fuel and in your use of energy for transportation.”

Dodman found that the average Canadian is responsible for 24 tonnes of greenhouse gas emissions each year, while Torontonians just 8.2 tonnes.

By eating the algae, the salps turn the algae and their carbon dioxide into faeces which drops to the ocean floor. They also take carbon to the floor with them when they die after a short two-week life cycle.

This is thought to be a natural form of carbon sequestration similar to what scientists are trying to do with carbon capture from emission sources such as power stations.

Dr Baird said Australian salps are biologically closer to vertebrates such as humans than to jellyfish because they have the rudiments of a primitive nervous system.

‘They are interesting because they are the fastest reproducing multi-celled animal on the planet and can double their numbers several times a day.’

Zoo board members heard that a digester big enough to produce 4 megawatts could power the zoo plus 15,000 homes in Scarborough.

The technology isn’t new. It’s used extensively in Germany, for instance. Staff told the board the process doesn’t involve incineration, and there’s no combustion.

It could be running soon and would reduce the zoo’s carbon footprint by 40 per cent, staff said.

The zoo keeps a large pile of animal waste on site, some of which is used as fertilizer. One by-product of a biogas facility could be a higher-grade fertilizer, which De Baeremaeker suggested could be sold.