Well I need to withdraw that statement then, it is not impossible but incredibly unlikely without vast finances beyond the reach of many countries, let alone ISIS. Also reqires a delivery system more advanced than USA, UK or USSR.
"How he thinks the Earth's axis would change like this is beyond me and is just fantasy."
Actually the earth's axis routinely changes over a 40,000 year cycle - not by much, admittedly, but it doesn't need to vary much to bring about some major changes in climate.
In about 10,000 years time winter in the Northern hemisphere will begin in June, and 10,000 years after that it will be back to starting in January. At the moment the axis points at the North star(Polaris), but in 10,000 years it will point at Vega.