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Cultivated plants become a tall stalky crop that usually reaches between 6 and 15 feet, and generally consist of a single main stalk with few leaves and branches. Hemp plants grown for fiber or oilseed are planted densely (about 35-50 plants per square foot) 10 to discourage branching and flowering. The period of seeding to harvest ranges from 70 to 140 days, depending on the purpose, cultivar or variety, and climatic conditions. The stalk and seed is the harvested product. The stalk of the plant provides two types of fibers: the outer portion of the stem contains the bast fibers, and the interior or core fiber (or hurds).
Industrial hemp production statistics for Canada indicate that one acre of hemp yields an average of about 700 pounds of grain, which can be pressed into about 50 gallons of oil and 530 pounds of meal. 11 That same acre will also produce an average of 5,300 pounds of straw, which can be transformed into about 1,300 pounds of fibe
How can buildings help with climate change? It’s all about renewables and “sequestered carbon”.
The Department for Business, Innovation and Skills’ 2010 report on Low Carbon Construction concluded that construction was responsible for around 300m tonnes of carbon dioxide emissions, which is almost 47% of the UK’s total. Of this, around 50m tonnes is embedded in the fabric of buildings.
Making one tonne of steel emits 1.46 tonnes of CO2 and 198kg of CO2 is emitted make one tonne of reinforced concrete. One square metre of timber framed, hemp-lime wall (weighing 120kg), after allowing for the energy cost of transporting and assembling the materials actually stores 35.5kg of CO2.
If we can convert plants into building materials, we are in a win-win situation. Plants use the energy of the sun to convert atmospheric CO2 and water into hydrocarbons – the material from which plants are made.
The plant acts as a carbon store, sequestering (absorbing) atmospheric CO2 for as long as the plant continues to exist. This CO2 is only re-released when the material is composted or burnt, and the great thing is that through replanting it you can re-absorb this CO2 annually, in the case of straw or hemp, or every decade or so in the case of timber, rather than the 300m years that it takes to recycle coal or oil.
Secondly, plant based materials can be used to make high performing building envelopes, protecting against external weather and making a building more comfortable, healthy and energy efficient to live in.
Not only can they be used as insulation materials, displacing oil-based alternatives such as polyurethane foam, but they also interact with the internal environment in a way that inorganic materials just can’t do.
This is because they are “vapour active”. Insulating materials such as hemp-lime, hemp fibre and wood fibre are capable of absorbing and releasing water vapour. This is doubly effective, because not only can they act as a buffer to humidity (taking moisture out of the air), but they also stabilise a building’s internal temperature much better through latent heat effects (energy consumed and released during evaporation and condensation within the pores of the material).
Strong made his fortune in the oil and energy business running companies such as Petro Canada, Power Corporation, CalTex Africa, Hydro Canada, the Colorado Land and Cattle Company, Ajax Petroleum, Canadian Industrial Oil and Gas— to name just a few.His private interests always seemed to be in conflict with his public persona and his work on the world stage. Strong’s extensive range of contacts within the power brokers of the world was exceptional
obviously there are industries that are destroying our environment at an incredible rate, oh take for example the chemical companies saturating our soil with pesticides/herbicides. You know Dow, Dupont, Monsanto, Syngenta etc. Where is the campaign from all of these concerned global warming scientists, surely they should be able to see this as an issue?
originally posted by: Mianeye
a reply to: 727Sky
Scandinavia has become ice free, 25 years ago the seas were frozen every year with temp's below freezing most of the winter season, ice breakers were in constant movement to secure the ships routes, today the icebreakers are sold as there is no need for them anymore.
Today we are very lucky if we get a little cold to freeze the lakes for ice skating, snow is a past, maybe a little sleed, but tons of rain.
The warming is definitely visible here, it's just not moving as "fast as predicted".
originally posted by: rukia
a reply to: elementalgrove
Great video. Definitely eye-opening on the case of the 'endangered' polar bears.