People planted a diversity of varieties of a crop species to include those adapted to shorter or longer growing seasons, resistant to different diseases and local soil conditions and so on (Boedhihartono, 2004). This meant that they “evened out” the volatility caused by higher yields in years with “good” weather but lower yields in years of extreme drought. The knowledge, crop varieties and management practices employed to deal with climate variability are a valuable foundation upon which to build in dealing with climate change. But alone they are not adequate, as the direction and magnitude of future changes will greatly exceed the variability that traditional practices have evolved to address.