STOCKHOLM, Oct. 20 (Xinhua) -- World's leading energy scientists on Tuesday called for reduced use of fossil fuels, in the run-up to the UN Copenhagen Climate Change Conference to be held in December.

    They made the call in a statement issued at the end of the two-day Energy 2050, International Symposium on fossil-free energy options organized by the Royal Swedish Academy of Sciences in Stockholm.

    "Time is of the essence for radical changes to the global energy system while life cycle analyses and ecological economics are essential prerequisites for future policy thinking," said the statement.

    "Human energy activities must be developed so that land, water and air are not drastically affected. All future energy options should rely on sustainable fuel and construction materials which are in principle recyclable or durable," added the statement.

    It also stressed that agriculture production should be used primarily for food while avoiding global deforestation and maintaining biodiversity.

    The statement points out that electricity will have to become the major energy carrier in the future since most of the non-fossil energy sources provide electrical energy.

    Fifteen leading scientists including Professor Carlo Rubbia, Nobel Prize Laureate in Physics 1984 and George A Olah, Nobel Laureate in Chemistry 1994 presented their research in nuclear, solar, wind and bio-energy, low carbon vehicles and energy efficiency issues with an audience of about 350 people.