Fuel were present at the sites. As a fuel, wood has remained in use up until the present day, although it has been superseded for many purposes by other sources. Wood has an energy density of 10–20 MJ/kg. Recently biofuels have been developed for use in automotive transport (for example Bioethanol and Biodiesel), but there is widespread public debate about how carbon efficient these fuels are. Fossil fuels are hydrocarbons, primarily coal and petroleum (liquid petroleum or natural gas), formed from the fossilized remains of ancient plants and animals by exposure to high heat and pressure in the absence of oxygen
The Secret Life of Plants the basis for the 1979 documentary of the same name, directed by Walon Green and featuring a soundtrack by Stevie Wonder, later released as "Journey through the Secret Life of Plants". The film made use of time-lapse photography (where plants are seen growing in a few seconds, creepers reach out to other plants and tug on them, mushrooms and flowers open). The film was originally distributed by Paramount Pictures. The Secret Life of Plants The Secret Life of Plants (1973) is a book by Peter Tompkins and Christopher Bird. The book documents controversial experiments that claim to reveal unusual phenomena