books.google.ca - Part 3. Survey of types of evidence of past climates over last million years and methods of dating evidence. Part 4. Events of last 15 years leading to problems of estimating course of fut- ure development and man's influence on climate....http://books.google.ca/books/about/Climate.html?id=-lJ6XesnYYAC&q=observed&utm_source=gb-gplus-shareClimate