...And name calling is the last stop for those who have run out of logical arguments.  I have not called anyone here a "denier" and I'll assume you'll never call anyone a "leftist."  

The frustration felt from those who have accepted the scientific consensus stems from their feeling that the planet is headed in an unprecedented direction (due to human causes) and yet there are still many who balk about doing anything about it.  The world is not about to end, they feel, but the human habitability of it "may" be ending.  At the very least it definitely headed toward uncharted territory for us.  

So when people claim they think nothing is happening, or we couldn't have possibly caused it (what a joke!), it is alarming that they are not accepting of the very same science that brought you computers, cars, energy production, modern medicine, etc.  What is the downside to pushing for cleaner energy?
Heaven forbid we actually clean up our bedroom, so to speak.