title: Global Energy Crisis
abstract: This chapter describes the global energy crisis. It also describes the current global energy status, as well as the causes and effects of the global energy crisis. Environmental risk is considered the most important global energy crisis, especially climate change. The chapter discusses the energy return on investment (EROI), including discussion of the EROI concept and related controversy. EROI is the mathematical relationship between the energy delivered and the energy source. On the surface, r