Our energy use and its consequences ‎(‎including climate change‎)‎ motivate some of the most contentious and complex public debates of our time‎.‎ Although these issues are often cast in terms of renewable versus non‎-renewable energy‎,‎ in reality both depend on finite Earth resources‎.‎ The evolution of the Earth itself therefore offers a uniquely illuminating perspective from which to evaluate alternative pathways toward energy and environmental sustainability‎.‎ Geofuels‎:‎ Energy and the Earth systematically develops this perspective using informal‎,‎ nontechnical language laced with humor‎.‎ It is well suited to a broad readership‎,‎ ranging from beginning university students to lifelong learners who are interested in how the Earth‎'‎s past will influence their own future‎.‎ It also provides simplified explanations of controversial topics‎,‎ such as energy return on energy investment‎,‎ peak oil‎,‎ and fracking‎.‎ The focus throughout is on building a sound physical understanding of how natural resources constrain our use of energy‎.‎