Here is the common sense: in just roughly 150 years, we human beings have burned-up about half of the recoverable accumulated energy/carbon of hundreds of million of years of solar energy stored in the form of petroleum, coal, and natural gas.
The notion that releasing all that energy in such a very short period of time wouldn't have a significant impact on the earth's environment defies common sense. From the beginnings of the Industrial Revolution until now, the actions of human beings have added significantly to the amount of green house gases in the atmosphere.
Then, of course, there is the science that backs-up the concept of human-caused (anthropogenic) climate change.
Denial of anthropogenic global warming is at its base about money -- the infamous Koch brothers, the mega-transnational energy corporations, oil speculators -- and all the campaign contributions they make especially to Republicans in the United States in the hopes of preserving profit. Along the way the profiteers pick-up the fearful conspiracists, the religiously deluded, the no-compromisers, the 'Tea Party' and various assorted sycophants of the plutocracy.
The study reported on May 12 about the melting of the west Antarctic ice shelf is sobering news and should have a unifying effect on humanity -- we are in peril and a sense of urgency ought to accelerate our efforts to face this crisis head-on.
This video well describes the science in the study:
Redirection away from fossil fuels is in our own self-interest for even modestly maintaining the current American standard of living. The reality of Peak Oil looms large and its effects are self-evident in any visit to the gasoline pump -- $100 a barrel oil is here to stay because the cheapest, easiest to produce oil is fading away. Besides the production constraints illuminated in this article 'Why the Oil Industry is Running Into Major Trouble', no further proof of Peak Oil is better than the Keystone XL tar sands pipeline controversy -- it is all about non-conventional oil production and delivery to the international market place for the further profit of the Koch brothers and the 1 percent.
It is truly unfortunate and momentously tragic that in these early years of the 21st century, in the world's allegedly most advanced nation, we are still having arguments about science, politics, religion and the impacts of human activity on the environment of the planet Earth. Our failure thus far to come together to seriously find solutions to anthropogenic climate change will have portentous, historic consequences ... and time is indeed finally running out.