The methods used to predict future global warming are based on computer models, not actual temperature readings. And even the models are changing their forecasts. In 1990 the UN Intergovernmental Panel on Climate Change said global temperatures would climb more than 3 degrees C by the year 2100 if we didn’t make radical cuts in greenhouse gas emissions such as carbon dioxide and methane. Now the same group says the earth might only warm 1 degree C. One degree? But the earth was that warm a thousand years ago during the last climactic optimum! So why the alarm?