Some skeptics view climate science as a house of cards. You pull one card from the bottom and the whole thing collapses. But science is more like a jigsaw puzzle, assembled piece by piece over decades of research. Gradually, the overall picture emerges, until it's unmistakable. Remaining gaps or even a few misplaced pieces don't change the overall picture.
"Some say, 'Climate is always changing due to natural cycles. So it can't be us doing it.' That's like saying 'People die from natural causes. So there can't be murder!' Any good crime investigator must develop expertise on natural causes of death, so he can distinguish it from foul play. Same with climate scientists." — Dr. Richard Alley
Saying "climate change happened naturally in the past, and therefore human's can't cause it" is like saying "forest fires occurred naturally in the past. So there can't be arson."
Variation: Arson and camper carelessness can't cause fires, because forest fires often occurred naturally before people even existed!
"What’s more socialist than American taxpayers subsidizing the fossil industry while they fleece our wallets? Perhaps Exxon should be renamed The People’s Oil Company of America." — Richard Whiteford, Environmental Communications Consultant in Downingtown, Pa.
"the climate changed before so we aren't changing it" is like saying "beavers felled trees before mankind, so lumberjacks cannot exist." — Sebastian Sassi
Claiming that 'Earth isn't warming, because 2008 was cooler than 1998' is like saying 'Spring isn't happening, because April 15th was cooler than April 1!' To see the long term trend, you have to look at all the data.
97% of engineers agree bridge ahead will collapse. 3% say not to worry. Would you keep driving?
Suppose you saw a dead body in a crime scene. Would you believe a police detective who says, 'A ghost did it!' when there's evidence everywhere that a particular person committed the crime?
Saying 'stopping the Keystone pipeline won't stop global warming,' is like a civil rights skeptic saying in 1960, 'Why Woolworth's lunch counter? Getting served a cup of coffee won't end racism.'
‘Weather is what you see outside your window, climate is what you see from a satellite.’ – Scott Mandia, Professor of Physical Sciences at Suffolk County Community College, New York.
Human's aren't the first species to alter the atmosphere; that distinction belongs to cyanobacteria, (blue-green algae) which, some two billion years ago, invented photosynthesis. But we are the first species to be in a position to understand what we are doing.
We are not the radicals. Oil companies are the radicals. They are willing to alter the chemical composition of the atmosphere to make more money. - inspired by Bill McKibben, environmental author and founder of 350.org