11.   He said both the warming effect of burning fossil fuels and the atmospheric build-up of the carbon dioxide produced increased temperatures.

12.   Insurance losses were exceptionally low because the warming effects of El Nino prevented any major storms from hitting the East Coast.

13.   Something to do with the warming effects of the El Nino, they say.

14.   The geologist said there is evidence of the warming effect on the Antarctic mainland.

15.   The warming effect of the recurring weather pattern known as El Nino produces more evaporation and therefore more rain.