If the object is heat, the medaevil practice of growing coppice trees for firewood is the most efficient form of solar heating yet devised. One hectare of trees will produce about 60 CU Mtres of firewood a year ( cut 1/15th per year rotation and is self financing) to get the same energy equivalent from bio oil would take 5 hectares and cost about 35 cents per liter processing costs. The main reason is the seeds that are pressed for oil make up a very small part of teh bio mass grown, wheras with trees, most of teh wood is used for fuel. An Hectare of trees will provide enough wood for three large houses heating and cooking needs for a year
The establishment of a hectare of coppice will recover about 400 tonnes of carbon from teh atmosphere and then remain carbon neutral for several 100 years. Wood is less convenient to use than oil for domestic heating, but the technology is easily understood. On small or an industrial scale is very efficient.

One thing's for sure - capitalism is running off with our money, whichever way you cut it. OldBmw is right - a diesel bike is the answer. It seems there's a diesel bike rally in Germany each year - I must enquire further.

well I agree with your 1st statement... for sure...
and it's going hand in hand....
but about running a Diesel bike.... well, 1st look at the price for Diesel... it's not that far away from normal fuel.....
and I don't believe or even trust the German government (regime)... at all........ if I remember back to the beginning of the 90's........ the fuel started rising there Diesel remained cheap and the Gov... started forcing people to buy Diesel cars to get older STD-cars off the road in a big manner, making it attractive of being low on TAX and low on Diesel price... than after a few years when Mr.Normal supported the car industries by running there new 2.5Lt Diesel engines, suddenly the Gov... raised the TAX for diesel cars on a massive scale and the hole thing was a big fraud... higher TAX on Diesel followed...... at the time I was still enjoining my 25 year old 3.5lt-V8 ex-MOD 3,5Tonne Land Rover running on 91okt..... cheaper on TAX, insurance and fuel all together than people have invested in there "new" Diesel car.......... at the end I swooped this beloved truck for a 625cc bike as my only transport.......

The thing is, if the demand of some thing is high.... the price will be used to rip off every one........... same will happened to Diesel bikes... well there exhaust soot is a reason (environmental) just look at HGV..... they pay and pay..... no mater what they put in to here tank, mineral Diesel or BIO-Diesel.... BIO-Diesel will go up as well will be used to rip off people again (demand for food will be the reason this time as an argument to cash in on TAX) it's the same old game... 1st make people dependent on a source than use it to empty there pockets....

well.... Diesel is only good for heating and tractors, LPG is only good for cooking, Benzine is good for driving, alcohol is good for drinking, wood can be used for various things but not for drinking......... ;)

Oh yeah I forgot coal as a source of energy......... that's for free..... :)
at least here in Berlin..... all this "central-heater-wishers" this days, dumping there old coal they had stored in there cellars on the streets in winter for others to use it.... the last two winters I didn't spent a penny on heating that way... just picked it up..... reminds me on that old song "tattoo'd lady from Rory Gallagher"....... ;)
a nomad live... sooner or later... or already now.......

spooky

Details can be found here DieselBike.net The Original Diesel Motorcycle website.

I will be going again this year.

Been there, done that.... ahhhh 2.43USD/Gal..... that was nice.
Even 4.50USD in Big Sur was ok :-)