Of the 178,000 Terawatts of energy avalaible to earth , only 100-200  TW can be captured by plants, this is a very low percentage and in my opinion could give serious cause for concern with respect to future plans for bio-energy. There will not be a great level of productivity to help solve a solution for the ever increasing problems of higher energy demands and needs. In a similar case , of the 40,000 TW available to the hydrological cycle only approx. 0.01 TW or .1% can be derived from that of hydro-electricity.  Altough ethically and theoretically the ideas of these bio-energy sources seem very positive , one must not look through rose tinted glasses and realise , this poor energy retention can have a serious impact on their means as sustainable sources.

Across the world there are hundreds of examples when man-kind are not realising the full potential of their available ressources. On earth there is 13billion hectares of  land , of which

  • 5billion is used as agricultural land
  • 1.5billion is used or nurished icorrectly as has potential to become good agricultural land
  • 3.5billion is grassland which supplys animals their food and energy , which humans then consume
  • 3billion is unsuitable land such as desert or frozen

Along with worries of the amount energy available , the problem is becoming more complicated due to the increasing population of the world. Some believe it may rise to between 7.5 and 11.5 billion by 2050 , this will put substaintial pressure not only on energy demand but also food demands globally. Ever since the Industrial Revolution there has been a global population explosion. Although it is well within the earths capacity to produce enough food even if the population does rapidly continue to rise the main problem is distribution.

 Developed countries in the west usually have a surplus of food which unfortunately ends up just beeing dumped or left to waste. While this is happening millions of people and children are starving in poor developing countries. I think there is a very large problem with food distribution which should and must be looked at by world leaders.  It is estimated that if all the world productive lands operated at maximum (including irrigation) to high level productivity could theoretically rise by 10 times. This in my opinion is hugely signifigant as if the arable lands, many which are in the developind south could be rised to european production standards, this would lwad to huge steps taken towads solving world hunger.

Altough there are cleary many challanges ahead , I believe that there are achaivable steps that can be taken to help provide for the future