global warming threat ?

No I don't think temp is rising because of global warming. There was growing grass on antarctica once, there was an ice age. The temperature of the earth is like a sinus wave. Actually, if you look at the average temperature of the earth on the last 250million years, it's still too cold, so it's good that the earth's warming up! Some say only 4% of the rise of the temperature is coming from us (humans), 25% from the earth and 71% from the radiation of the sun and the milky way. Because we are currently almost in perfect alignment with the core of the milky way, we encounter severe storms, temperature rises and drops etc... When we have reached this point (in december 2012) the earth magnetic field will shift (north becomes south and vice versa) and the earth stops spinning for 3 days. 3 days of darkness (or light if you're on the other side of the earth). Temperature will rise about 20 degrees then, so no. I don't think it's global warming

The biggest threat in this world is global warming.

I believe the consensus is that it has risen around .02 degrees celsius in the past century, which is pretty inconsequential. The estimate was that it was going to be 2 degrees celsius, and all the doomsday predictions were based on that.