Letters: ExxonMobil and polar bear research | Environment | The Guardian

I do not write papers because ExxonMobil or Greenpeace pays me to, but because my academic researches demonstrate that the sun, not carbon dioxide, is the chief driver of Arctic temperatures, and that much of the "evidence" for the bears' imminent demise is speculative. Indeed the population has increased fivefold since the 1950s, mainly because of restricted hunting. Where the Arctic has cooled, bears dwindle: where it has warmed, they increase.

Polar bears evolved from brown bears 200,000 years ago and therefore must have survived the last interglacial period, when global temperatures were many degrees warmer than the present. More perspective and less prejudice, please.
Willie Soon
Salem, Massachusetts, USA