The consensus of the climate is a joke. Just recently one the head authors resigned because of exaggerating and changing the findings.

Dutch Professor Richard Tol has resigned from the Climate Panel of the UN. Professor Tol disagrees with the biased negative conclusions of the latest UN climate report. The consequences of climate change are being systematically over-estimated, according to him. "The Panel is directed from within the environment lobby and not from within the science."

http://www.principia-scientific.org/climate-professor-quits-biased-global-warming-ipcc.html

Warming fears are the “worst scientific scandal in the history…When people come to know what the truth is, they will feel deceived by science and scientists.” - UN IPCC Japanese Scientist Dr. Kiminori Itoh, an award-winning PhD environmental physical chemist.

“The IPCC has actually become a closed circuit; it doesn’t listen to others. It doesn’t have open minds… I am really amazed that the Nobel Peace Prize has been given on scientifically incorrect conclusions by people who are not geologists.” – Indian geologist Dr. Arun D. Ahluwalia at Punjab University and a board member of the UN-supported International Year of the Planet.

“Temperature measurements show that the [climate model-predicted mid-troposphere] hot zone is non-existent. This is more than sufficient to invalidate global climate models and projections made with them!”- UN IPCC Scientist Dr. Steven M. Japar, a PhD atmospheric chemist who was part of Intergovernmental Panel on Climate Change’s (IPCC) Second (1995) and Third (2001) Assessment Reports, and has authored 83 peer-reviewed publications and in the areas of climate change, atmospheric chemistry, air pollutions and vehicle emissions.

http://www.climatedepot.com/2013/08/21/un-scientists-who-have-turned-on-unipcc-man-made-climate-fears-a-climate-depot-flashback-report/

Former NASA scientist says gobal warming is nonsense.

“If you talk to real scientists who have no political interest, they will tell you there is nothing in global warming. It’s an industry which creates vast amounts of money for some people.
“The reason records seem to be being frequently broken is simply because we only started keeping them about 100 years ago. There will always be some record broken somewhere when we have another natural fluctuation in weather.
“Its absolutely stupid to blame floods on climate change.
“This is not the way science works. If you tell me that you have a theory there is a teapot in orbit between the earth and the moon, its not up to me to prove it does not exist, its up to you to provide the reproducible scientific evidence for your theory. Such evidence for the man-made climate change theory has not been forthcoming.”

http://www.climatedepot.com/2014/04/03/another-prominent-scientist-dissents-fmr-nasa-scientist-dr-les-woodcock-laughs-at-global-warming-top-prof-declares-global-warming-is-nonsense/

Earth is Safe From ‘Global Warming’ Say the Men Who Put Man on the Moon

The planet is not in danger of catastrophic man made global warming. Even if we burn all the world’s recoverable fossil fuels it will still only result in a temperature rise of less than 1.2 per cent.
So say The Right Climate Stuff Research Team, a group of retired NASA Apollo scientists and engineers – the men who put Neil Armstrong on the moon – in a new report.
“It’s an embarrassment to those of us who put NASA’s name on the map to have people like James Hansen popping off about global warming,” says the project’s leader Hal Doiron.
Doiron was one of 40 ex NASA employees – including seven astronauts – who wrote in April 2012 to NASA administrator Charles Bolden protesting about the organization’s promotion of climate change alarmism, notably via its resident environmental activist James Hansen.

http://wattsupwiththat.com/2014/03/08/the-group-the-right-climate-stuff-team-says-there-no-need-to-worry-about-catastrophic-global-warming/

And that's just some of them.