Do you know what causes gravity?  What you know about gravity is that when you drop something it falls to the ground.  What you know about spreading germs is that if you touch someone who is sick, you get sick.  What personal experience do you have that you are so sure that climate change was caused by man-made burning of fluorocarbons?  Your only "experience" is what some government-funded scientists have hypothesized.  You know nothing.

Did you know that consuming saturated fats cause arterial disease?  It doesn't.  Did you know that eggs are also harmful because of their cholesterol content?  They're not.