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Though probably today the most commonly known and used are store-bought packages of dried yeast, there are several other different kinds. The recipes that follow show two examples of different ways to make yeast--dry yeast cakes made from hops and an everlasting yeast "starter"--and also how the yeasts are used in making bread.
The dry yeast cakes are made in part by boiling the blossoms of the hop vine. These flowers contain a fragrant yellowish oil called lupulin. The use of this oil as a preservative in beer and as a narcotic drug originated in Germany before Charlemagne. Since then its use has become widespread and the vine cultivated in other nations, including America.
Jan 9 Urban sustainability UK: Urban co-design for better wellbeing and health: Healthy New Town [1]
Jan 9 Climate news 2019: Climate change: 'Right to repair' gathers force [2]
Jan 4 Norway: Oslo starts its year as European Green Capital 2019 [3]
Jan Urban sustainability news: Happy space [4]
Jan 3 Towards sustainable economies news: Nesta's 'ShareTown' interactive shows what a cooperative, tech-enabled economy might look like [5]
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Transport. According to the Appropriate transport manual, sustainable transportation is a strategy for the flow of people and goods across the Earth that meets the needs of the present without compromising the ability of future generations to meet their own needs. Transportation accounted for 32.6% of US green house gas emissions in 2005. In addition to the widely publicized environmental consequences of driving automobiles, it is also socially and economically costly:
Building and encouraging alternatives to the single-occupant vehicle, or, for short "alternative transportation," is imperative. Some alternative transportation advocates have taken to using the term, sustainable transportation, instead of the previous, widely-used "alternative transportation" term to avoid sidelining their interest from the mainstream. Many efficient, practical, and inexpensive sustainable transportation technologies already exist, meaning activism, policy work, and planning research is most often more crucial to developing sustainable transportation than technology development. |
Engineering 308 (Engr 308), Technology and the Environment, is a course taught at Humboldt State University, currently by instructor Lonny Grafman.
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