Under the Copenhagen Accord, China agreed to reduce its greenhouse-gas intensity by 45 percent in 2020 (relative to a base year of 2005).

(a) What annual growth rate gives you a 45 percent decrease over 15 years? (a decline is a negative growth rate)

(b) If affluence also grows at 7 percent/year and population grows at 1 percent/year (in addition to the change in greenhouse gas intensity), what would be the change in total emissions over the entire time period?