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Archive for October, 2009

Yahoo Vs Google – Who’s Greener?

Silicon Valley is known for both innovation and hype. Recently, this pool of innovation has extended beyond bandwidth to the protection the environment. Google and Yahoo, the search engine giants, are both headquartered in the Valley and have been making headlines by greening their offices, reducing energy consumption, and carbon trading. The PR motivations are obvious, but are the green benefits really there? To set apart the hype from reality, we have analyzed the green value of both Google and Yahoo’s headquarter facilities.

We looked at the ecological services provided by green landscape features such as trees and open space (i.e. grass). Grass and trees are pervious surfaces, meaning they allow water to permeate into the ground. Roofs, sidewalks, patios, and asphalt parking lots are examples of impervious surfaces, where rainwater drains into the public storm drains. Heavy metals, oil, and other pollutants are carried off parking lots in rainwater, which often lead directly to open water habitats, where fish, birds, and reptiles live.

In terms of ecological services, trees and grass have been proven to:

1.      Remove and store carbon from the atmosphere,

2.      Remove certain airborne pollutants,

3.      Permits rainwater to seep into the ground as opposed to draining into the stormdrains, and

4.      Remove certain waterborne pollutants.

Here is a look at how green Google and Yahoo really are and how the measure up against each other.

Google Green Report
Google’s headquarters, the Googleplex, covers 44 acres, nearly 50% of which is grass or tree canopy. This is an impressive paved to open space ratio. The grass and trees on the Googleplex remove roughly 2 tons of carbon from the atmosphere per year, or 0.04 tons per year per acre. In addition, 530 lbs. of air pollution are removed per year (e.g., ozone, carbon monoxide, nitrogen dioxide, sulfur dioxide, and particulate matter), or 12 lbs. per year per acre. It was assumed that the parking lot of the Googleplex is asphalt, and not a type of porous pavement, so the cost of managing rainfall runoff from the Googleplex is $4,474 per year, or $103 per year per acre. The abundance of grass and tree canopy on the Googleplex go a long way to offset the water quality impacts of the paved surfaces (mainly the parking lot). On average, the grass and trees reduce water pollution by 6%, as opposed to the entire property being paved.

Yahoo Green Report
The Yahoo headquarters, Yahooplex, covers 28 acres, a third of which is grass or tree canopy. This is a classic ratio of paved to open space for large office complexes in California. So far, par for the course. The Yahooplex removes 0.36 tons of carbon from the atmosphere per year, or 0.01 tons per year per acre. 114 lbs. of air pollutants are removed per year, or 4 lbs. per year per acre. In terms of rainfall, the cost associated with runoff is $9,219 per year, or $331 per year per acre. The grass and tree canopy help offset the paved areas with a 2.3% reduction in water pollution as opposed to the entire property being paved.

The final green analysis?

Google kicks Yahoo’s butt, largely due to the forethought, or luxury, of the Googleplex having 50% of its property surface providing green services. The good news for both Google and Yahoo is that over time, as trees grow, so will the tree’s canopy and mass, thus storing more carbon and removing more air pollutants.

Green next steps for both Google and Yahoo is to:
 

1. Install porous parking surfaces, allowing up to 80% of rainwater to seep into the ground,
2. Install green roofs, absorbing rainwater while reducing cooling costs and energy consumption, and
3. Planting larger trees on the south and west sides of the buildings to reduce cooling costs and energy consumption.

While we crunched the hard numbers to settle the Google vs. Yahoo green debate, this report illuminates the great opportunity that awaits these two Silicon Valley giants to harness the ecological services of green surfaces.

Chris Erichsen is a GIS Mapping consultant with the Erichsen Group, GIS and Mapping in northern California. He has over 10 yrs of GIS experience and helps many industries around the world apply GIS mapping technology. Learn more examples of GIS mapping capabilities.

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Environmental Statements – How to Address Contaminated Land Issues

Under the relevant European Directives, an Environmental Statement is the formal product of an Environmental Impact Assessment. Environmental Statements are often organised in a way that describes the environmental baseline, mitigation and effects for each type of environmental receptors: ecology, water resources, archaeological resources, human beings etcetera. Contaminated land is often managed in the same ways as the various environmental receptor groups, although it is principally a cause of impacts rather than a receptor. It also often refers to a pre-existing condition and its damaging effect is on a variety of different receptors such as human health, structures and buildings, surface water features, groundwater features and ecology. This often means that land contamination specialists struggle with integrating the issue in a logical manner in an Environmental Statement. Sticking to the structured approach of an environmental statement is essential to ensure a clear description of the existing environmental condition, the potential impacts and the actions taken to avoid, minimise, offset or manage the impacts. This article is based on UK practice and legislation, although fundamentally the issues should be similar within other contexts.

Contaminated land is in many countries considered on a source-pathway-receptor basis. This is important to understand the impact land development can have on the issue of contaminated land. Development can interfere with any of these three elements. It can introduce sensitive receptors by changing the use of land, for instance by building new residential units on a site that was previously used for heavy industry. New pathways linking pre-existing contamination with an existing receptor can be formed, for instance when piling through a non-permeable layer connecting a layer of contaminated soils with a deep aquifer. Finally by introducing pollutants on the site a development project can introduce a potential source of contamination.

The second element to consider is the structured approach of an environmental statement. Apart from the introductory and procedural elements described in the environmental statement, a good environmental statement comprised the following sections:

• environmental baseline conditions
• potential environmental impacts
• mitigating measures
• residual environmental impacts

There should be a logical relation between the different sections. Any receptor that is affected and described in the section about the potential impacts and effects should have been introduced in the section describing the baseline. Any material impact should be assigned a mitigation or management action etc. Implementing this structure allows a clear description and understanding of the environmental impacts and the way it will be managed.

Applying these principles to contaminated land will result in a baseline condition section that describes the current sensitive receptors that are present within the potential sphere of influence of the development, the sensitivity and importance of these receptors, the presence of any pre-existing contamination and the presence of actual and potential pathways. The next section, potential environmental impacts or effects, first considers the impacts that the development will have in terms of the introduction (or removal) of sensitive receptors and the creation of new pathways between existing and potential pollution sources and receptors. In addition this section will describe the potential environmental impacts that are associated with the introduction of new sources of contamination. In the third section, mitigating measures, a description of the actions to mitigate each of the impacts that may occur should be provided. Finally a statement of the residual impact of the development is provided in the last section: residual environmental impacts.

Paul Giesberg is an environmental consultant with a special interest in environmental impact assessment and sustainability in land use development.

Recycle Your Second Hand Clothes

Landfill in the UK is becoming a huge problem. With the drop in the price of recycled products, the issue is what to do with all of the waste that we produce. The breakdown of waste in landfill sites creates huge amounts of the greenhouse gas methane. There are also many products that will not breakdown and will remain in the environment for ever with the potential to contaminate water supplies.

Traid, a charity specializing in the recycling of textiles reports that 900,000 tons of shoes and clothing are thrown away each year in the UK. Only 200,000 tons per year are recycled and the rest is dumped in landfill. The government estimates that similar amounts of between 550,000 and 900,000 tons of textiles are thrown away each year.

In addition to the problems of waste and landfill in the UK, there is also the consideration of the energy used and waste generated by the manufacture and distribution of clothing and textiles. Growth of cotton uses a huge amount of chemical pesticides and environmentally damaging cultivation methods. The manufacture of man made fabrics also has a huge environmental impact with. Demand for polyester the most widely used synthetic fabric has almost doubled in the last 15 years. The manufacture of polyester uses large amounts of crude oil and an energy-intensive process. It releases emissions including volatile organic compounds, particulate matter, and acid gases such as hydrogen chloride, all of which can cause health problems for workers by causing or aggravating respiratory disease.

Second hand clothing is becoming more popular as people begin to recognise the real costs of fast fashion. Consumers are becoming more aware of their buying choices and ways that they can help the environment.

Finally, there is one more great reason to recycle second hand clothing. Just because you are fed up with a piece of clothing or it does not fit you nay more, it does not mean that it has no worth. You can make sure that the worth of your second hand clothing is realized by swapping it at a swishing party on a clothes swapping website, selling it or donating it to your favorite charity.

This article was written by Ceri Heathcote for posh-swaps.com, a website for swapping, buying and selling second hand and vintage clothing.

Clothes swapping and buying and selling second hand clothes is a great way to reduce the impact of fashion on the environment and to save money.

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