To say that "it's cold, so global warming is obviously a myth" demonstrates not only a fundamental misunderstanding of the claims about global warming, but also a life so unbelievably sheltered that it produced a complete and total ignorance of the Earth's periodic variations in temperature called "seasons".
Seriously, if you're going to spout off about how a scientific theory (global warming, evolution, the creation of the universe) is wrong, you look much less like a complete moron if you actually learn what the theory says so that you can argue against it intelligently.