11.   Climatologists have warned for a decade that the northern ice cap is retreating.

12.   Doctors have been warning for years about the rising rate of melanoma, the most aggressive form of skin cancer.

13.   Dermatologists have been warning us for years that melanoma is caused by overexposure to the sun.

14.   During the July fight, Golota never shied away from throwing body punches, even after he was warned for throwing low blows.

15.   Economists have warned for years that stock prices are unrealistically high, needing to fall by about a third, by one prominent estimate, to regain financial sense.

16.   Economists have warned for months that slower auto production would eventually show up in higher jobless rates.

17.   Experts have warned for years that children who attend residential schools for the deaf are at a significantly higher risk of being sexually abused.

18.   Fed officials have been warning for some time that with the U.S. supply of labor tight, pay increases could start pushing up prices of goods and services.

19.   Fighters can be warned for violations such as holding, hitting low or slapping with an open glove.

20.   Fire experts had warned for years that a buildup of combustible material in Western forests had reached vast and dangerous proportions.