When presenting the scientific facts behind climate change, global warming and the human influence on our biosphere, I was always hijacked by a vocal minority that cried foul about my "bias" to one side of the debate.
Debate? There's a debate?
For my whole academic life, I've known that humans impact our atmosphere severely and our relentless production of carbon dioxide (and other greenhouse gases) amplify the effects of the naturally occurring "greenhouse effect" that keeps our planet habitable. The more CO2 we pump into our atmosphere, the warmer the atmosphere gets.
This is a scientific fact based on decades of scientific study. The main cause of the increase in global average temperatures in recent history is not down to any natural cycle - although natural cycles do exist - it is down to us.
NOTE: At this point, you look outside and say, "Huh? This guy is nuts, we're under 10 ft of snow and experiencing record-breaking low temperatures! It's not global warming, it's global cooling!" you're not only incorrect, you don't understand the process of climate change. It may not be tropical in your back yard, but on average the world is heating up. Don't take comfort in the fact you're buried under snow, equatorial regions are telling an entirely different story.