Global energy consumption has doubled since the early 1970s, and experts predict it will expand another 50% by 2035. Unfortunately, this rising demand poses a couple of major problems.

Play the Energy Lab: http://www.pbs.org/wgbh/nova/labs/lab/energy/

Find discussion questions for this video and other resources in the Energy Lab collection on PBS LearningMedia: http://www.pbslearningmedia.org/resource/nvel.sci.tech.growapp/growing-appetites-limited-resources/