For 25th Feb 2013:
Read Meadows Thinking in Systems pages 66 to 72.
Read Beddington FOOD, ENERGY, WATER AND THE CLIMATE: A PERFECT STORM OF GLOBAL EVENTS? available as PDF download here. Slides of the accompanying talk available for download here.
For 28th Feb 2013:
Read Meadows Thinking in Systems pages 73 to 85.