Evidences of Climate Change

1.  Geological evidences of ice ages:  cirques, U-shaped canyons, pre-historical lake deposits,
      moraine deposits, pot holes, striated rocks.

2.  Fossilized plants and animals.

3.  Isotopic ratios in ocean sediment and ancient ice samples, e.g., N(O¹⁸) / N(O¹⁶) in oceanic core
     samples and in glacial ice deposits.

4.  Dendrochronology, i.e., tree ring growth rates.

5.  Lake bottom sediments.

6.  Documents.