Climate change: an unprecedented environmental challenge

Chapter 21 of 'An Introduction to Physical Geography and the Environment'

This is a free sample chapter from this book by Joseph Holden, University of Leeds, which is available at http://catalogue.pearsoned.co.uk/assets/hip/gb/hip_gb_pearsonhighered/samplechapter/Holden_2e_C21_screen_optimize.pdf (along with some other resources eg. MCQs at http://wps.pearsoned.co.uk/ema_uk_he_holden_physgeo_2/97/24915/6378251.cw/index.html) - it  quite useful for going into some depth about climate models, positive and negative feedbacks, potential impacts and climate policy.