Although the world’s energy resources have taken many millions of years to produce, we are quickly beginning to…..(1) These supplies. Recently a UN committee reported that the world’s oil and gas supplies would last about 100 years if used carefully. The report stated that…..(2)….. would be enough oil and gas for a century only if the present demand could be controlled. If the demand continued to ..(3)…., the report said that fuel supplies would…..(4)….for less than forty years. According to the report, governments must now take steps to control the amounts of fossil fuel which are used.