To bolster their charge the earth is heating up, global warming advocates point to computer models they say validate their alarmist claims. But are these models accurate? Well if one recent study is any indication, it would appear the answer is “No.” As reported in Investor’s Business Daily, a researcher in Sweden reviewed how well some leading climate models predicted the past – figuring if they could do that, they might serve as reliable indicators of the future. But when he examined how well they explained China’s weather over the last 50 years, he found less than half showed the right levels of precipitation in various regions, and virtually none mapped the entire country’s weather reliably in the least.