, gather indicators
of past climate conditions, and use biochemical markers to determine the gender and health of the animals that left them behind.
Confidence in the understanding of past climate change and changes in orbital forcing is strengthened by the improved ability of current models to
simulate past climate conditions.
In Antarctica's Dry Valleys, an expedition seeks the world's oldest ice and a potential treasure trove of information
about past climate conditions.
Scientists using ice - penetrating radar data collected by NASA's Operation IceBridge and earlier airborne campaigns have built the first comprehensive map of layers deep inside the Greenland Ice Sheet, opening a window
on past climate conditions and the ice sheet's potentially perilous future.
Still, there have been puzzles raised
by past climate conditions that have seemed to challange the consensus, which has generated futher research to understand the factors underlying the energy budget better for those periods.
A reason why many people may believe that Global Warming is just a theory is that they think that
past climate conditions are conjecture.
***** The color and width of tree rings can provide snapshots of Earth's
past climate conditions.