1. The production of zinc over the period XXXXXXXXXXincreased more or less steadily at a rate of 3.1% per year. The reserves, over the same period, increased by 3.5%. What conclusions can you draw...

1. The production of zinc over the period 19922006 increased more or less steadily at a rate of 3.1% per year. The reserves, over the same period, increased by 3.5%. What conclusions can you draw from this about the criticality of the zinc supply? What is your reasoning?

2. Global water consumption has tripled in the last 50 years. What is the growth rate, r%, in consumption, C, assuming exponential growth? By what factor will water consumption increase between now (2012) and 2050?