Become Quote by David Ignatius

... those who are absolutely certain that the rise in temperatures is due solely to carbon dioxide have no scientific justification. It's pure guesswork.

— Henrik Svensmark

My first inclination is to be a bit skeptical about the claims that human-produced carbon dioxide is the direct contributor to global warming.

— Buzz Aldrin

There is a majority of scientists that say that global carbon emissions by humans causes some changes in the climate.

— Marco Rubio

I think there's plenty of evidence that we need to stop spewing so much carbon into the air, that we're contributing to climate change…

— Lamar Alexander

...a vocal minority of scientists so mistrusts the models and the complex fragmentary data, that some claim that global warming is a hoax. They…

— Joanne Simpson

Global warming alarmists invariably try to make their case by resorting to rhetoric, dogma, opinion, and emotion. The closest thing to scientific data in…

— Walter Cunningham

Significant new peer-reviewed research has cast even more doubt on the hypothesis of dangerous human-caused global warming.

— Antonino Zichichi

Faced with the evidence, many deniers have started to admit that global warming is real, but argue that humans have little or nothing to…

— David Suzuki

I do believe that [climate change] is real.

— Kelly Ayotte

“As long as scepticism is based on a sound understanding of science it is invaluable, for that is how science progresses. But poor criticism…

— Tim Flannery

There are skeptics who do not come to their view because they have a source of income from carbon polluters.

— Al Gore

Those who believe in climate change, as I do, I think it's also fair to say that they are more receptive to confirming evidence…

— Cass Sunstein