They also hope to learn more about how specific climate conditions affect water yield.

All agriculture depends on the land resource and climate conditions prevailing at the time to be successful.

Today there are some similarities in climate conditions.

They span the past 60,000 years, giving us a year-by-year record of climate conditions.

Growth rings on two-metre deep drill samples, dating back a thousand years, were measured in the same way as rings are recorded on trees, to examine climate conditions.