Land used for growing camelina could be used for growing other legumes like soy and canola. Note the spread of crop types - camelina in the bean family, jatropha a tree and algae an aquatic micro-organism. I think there is little chance that above ground vegetable oil could ever produce enough bio-jetfuel so really algae should be the main contributor not the smallest. The whole exercise is therefore a greenwash. Possibly enough jet fuel could be made from coal at acceptable environmental cost if coal wasn't used for anything else. That won't happen therefore air travel will eventually be confined to the rich just like the early days.

If the real kost to remove all the airplane-CO2 would be accounted for in the ticket-price, we could fly completely green.
That would not be so much, since even coal-derived jet fuel (which is cheap and abundant) does not emit that much CO2.
If a price of 300$/ton would be set (which could easily pay for producing enough agrichar to remove the CO2), it would not even double the price of the fuel, so increasing the airplane ticket with only between 10 and 30%.
If cheaper ways of removing the CO2 are found or more efficient ways of producing biomass-derived fuel, the CO2-tax could deminish.

The beans are from the order Fabales (Leguminales) Legumonasae subfamily Faboideae Papilionoideae or alternately Fabaceae: pea family, (Papilionaceae.)

Camelina sativa is a member of the brassica family Brasicaceae, mustards,canola, broccoli.
High in omega 3 fatty acids rated very highly as a heart friendly healthy food (oil).
Grows in colder drier areas with low fertiliser requirements.
It may be more valuable as a food crop.

New biofuel crops are attracting interest but initial investigations by the Invasive Species Council (ISC) have found that many of these are potential major weeds- putting the economy and the environment at risk.
An ISC( Invasive Species Council) spokesman, Tim Low, said they have found that some of the plants being promoted by biofuel organisations in Australia to be serious weeds. "For example, a biodiesel company in Queensland has called on farmers to grow jatropha (also called physic nut), an Indian plant that is banned in Western Australia and the Northern Territory because of its weediness. "Jatropha is also closely related to bellyache bush - one of the worst weeds of grazing lands in northern Australia - and like bellyache bush it is poisonous to livestock. It could be a disaster if this plant was deliberately put in the ground as a crop in Australia," Mr Low said. Hitherto, its use has principally been as a constipation remedy.

Western Australia banned the plant in 2006 as invasive and highly toxic too ...BUT.......for Australia the case being developed by the Invasive Species Council against jatropha should be carefully examined. It is weedy........and can be very weedy!

Another account by a plant bbiology co. with affiliation with bio fuel co. writes;
On our recent trip to Far North Queensland to view Jatropha first planted by the Chinese gold miners, the harshness of the environment with which Jatropha can sustain became apparent. These planted are believed to be over 100 years of age and are still growing and producing fruit in the most adverse of conditions. The air temperature was in excess of 40 0C and the soil was mostly of rock substrate. These 100 year old trees had not shown any signs of invasiveness with the original patch all that was present. Even nearby cattle were seen grazing around these trees to no detriment. As inedible as Jatropha is, wildlife such as cattle aren't stupid enough to eat something that may not be palatable.

Jatropha was first introduced into Queensland around 1873 when gold deposits were first discovered. Chinese, in search of this gold, brought with them Jatropha plants which the oil produced from the fruits were burnt in their lanterns and stoves. These lanterns provided light through many hundreds of metres of tunnels excavated to find this gold.
Jatropha curcus oil has desirable physiochemical and performance characteristics as comparable to diesel. The oil is used as an illuminant without being refined and burns with a clean smoke free flame. The oil has very high saponification value and has been extensively used for making soaps in some countries. It is also used as an external application for skin diseases and sores for domestic live stock. The bark of Jatropha curcus yields a dark blue dye which is used for the colouring of clothes and various other things. Jatropha oil cake is high in nitrogen, phosphorus and pottassium which can be used for an organic fertiliser.
On our recent trip to Far North Queensland to view Jatropha first planted by the Chinese gold miners, the harshness of the environment with which Jatropha can sustain became apparent. These planted are believed to be over 100 years of age and are still growing and producing fruit in the most adverse of conditions. The air temperature was in excess of 40 0C and the soil was mostly of rock substrate. These 100 year old trees had not shown any signs of invasiveness with the original patch all that was present. Even nearby cattle were seen grazing around these trees to no detriment. As inedible as Jatropha is, wildlife such as cattle aren't stupid enough to eat something that may not be palatable.