Concerning the main topic, I don't think that brain structure or genes are solely responsible for how a person thinks or acts. The environment in which we grew up is the main driving force on our views. Statistically, children who grow up in conservative/liberal family/community will very likely have similar views. Calling each other evil, using insults etc... just worsens the partisanship.
Now, here is my opinion/knowledge on the Global Warming/Climate Change debate.
Global Warming is not the correct scientific term due to the fact that some regions register a decrease in temperatures. Climate Change include other factors such as shifts, variables etc... Global Warming is a sub category of Climate Change, it can be used to describe the average global temperature increase over several decades and explain the greenhouse effect.
To those who say Climate Change is a hoax/lie (or used for fear mongering) are uninformed.
The Climate Change process has been going on the entire history of our home Planet. Disclaiming Climate Change would be like disclaiming Gravity. Geological evidence show that the global climate has undergone strong changes, Earth being covered by ice in the Northern and Southern hemisphere except in the tropics by the equator. The opposite is true that Earth has experienced very warm periods where ice caps did not exist and global average temperatures were at least 5'C higher in the past than today.
CO2 concentration increases in the past 1.5 centuries correlate to the beginning of the industrial revolution. With todays CO2 concentrations at higher levels than the past 600,000 years. Longer than we, as a species, lived on the Earth so far. Concentrations of CO2 also correlate to atmospheric temperatures due to the studies of the absorption spectra of CO2. Yes, H2O has a much bigger absorption spectra but due to the fact that H2O levels have not changed and due to precipitation, water vapor is not a significant factor to the current global average temperature increase. But water vapor does contribute to the initial green house effect (about 60%), enabling the planet to sustain a comfortable temperature for life. CO2 contributes about 20%, while other gases like ozone, nitrous oxide, methane and several other gases contribute the other 20%.
Climate Change also encompasses Climate (Tropical Wet, Semiarid, etc...) shifts, biological effects (migration, deaths, etc...) effects of pollution (acid rain, ground level ozone etc...) material transport (ground, water and atmosphere). It is a very large and difficult subject to fully understand, some subcategories are fairly new concepts (material transport is a fairly young subject ~25 years). With current understanding, it will be difficult to fully understand the full effects of Climate Change but the principles can give us an idea. We know much more than we did 20 years ago and we will know more in the near future.
That doesn't mean we should just wait and do nothing to reduce our effects on the environment because 'we do not fully know the science of it.' Why not work ahead on improving lifestyle and health? The environmental movement in the 70s has lead to the 'Water Pollution Control Act', 'Clean Air Act', Endangered Species Act' etc... improving water quality, regulation of toxic substances, pesticides, ocean dumping and more. Increasing the quality of drinking water and living environment.
Just my 2 cents.
Cheers
Yanoda