Fossil reserves may last for another 30, 300 or 3,000 years. Current reports indicate that there is plenty of fuel, but it may not be wise to use all, because of risks related to climate change. We live in an age likely to be known to future historians as the fossil era. Fossil fuel usage is a relatively recent phenomenon, that started 150 years ago. Viewed over millennia, the fossil age is only a short bubble in time. The fossil age, historians may say, ran from mid 19th century to somewhere in the 22nd century, and was instrumental in emancipating mankind, enabling the industrial society in its upward swing, but later driven down by environmental considerations and limited fossil reserves.