There is significant evidence that would tend to falsify global warming. The mean global air temperature has not risen for the last fifteen years. At the end of March the global extent of sea ice was above the long-term average and higher than it was in March of 1980. Last December, snow cover in the northern hemisphere was at the highest level since record keeping began in 1966. The UK just experienced the coldest March of the last fifty years. There has been no increase in droughts or wildfires. Worldwide hurricane and cyclone activity is near a forty-year low.
When the facts are on your side, emphasize the facts. When you don’t have facts going for you, pound the table. The paragraph above is from a rebuttal to some table pounding done in a Washington state newspaper.