Dr. Ewe Noh-Watt of the New Zealand Institute of Veterinary Climatology has discovered that global warming is caused not by a buildup of carbon dioxide in the atmosphere, but rather by the decline of New Zealand's sheep population. The reasoning was that sheep are white, and therefore large numbers of sheep increase the planet's albedo (the amount of sunlight reflected back into space). As the sheep population declined, the ground was absorbing more solar radiation, thus warming the planet.