As the demand for energy continues to increase globally, fossil
fuel usage will likewise continue to rise. There is still a plentiful
supply of fossil fuels at reasonably low cost, although
this is likely to change in the future, but more critically the
ever growing use of fossil fuels is unlikely to be sustainable
in the longer term principally due to the attributed increase
in greenhouse gas emissions from using these fuels and the
environmental impacts of these emissions on global warming