The Dake Page has published a series of posts over the years exposing climate denialism. This post brings many of those posts together for easy access. Feel free to save this post for reference and take a look at each of the individual linked articles.
Remember, there is a consensus on the scientific consensus. As noted in the most recent IPCC report, AR5, "warming of the climate system is unequivocal" and human activity is the "dominant cause" of that warming.
Of course, deniers deny this 100+ years of unequivocal science. They can't provide any scientific evidence for their denial, so they resort to employing a series of tactics fed to them by lobbyists. These are the same lobbyists and same tactics as used by the tobacco industry and every other denial of science example for the last half century. This is how lobbyists work.
Climate Denial on the Internet - Who are the Deniers?
The Well Disarmed Skeptic - How Climate Change Denialists Use Front Groups to Lie About the Science
Scientific Debate of Climate Change on Social Media Sites
Global Warming Denialists - The Art of Deception
Spotting Climate Deniers on the Internet
How Climate Deniers Control the Message
How Climate Deniers Saturate Facebook With Fake News
Common Tactics of Climate Change Deniers on the Internet
Collusion Among Climate Denial Lobbyists and Their Spokespeople
How Climate Deniers Create Fake "Experts"
Yes, Some Experts....and Politicians...Are Dishonest
Why Climate Denialists Argue Even When It's Clear They Are Wrong
Googling the Internet - How Climate Deniers Get Their "Science"
How the Media Keep Climate Denial Alive
Parsing the Arrogant Ignorance of Climate Denial
The Confidence of the Dumb
Climate Denial Tactic - Repeat a Falsehood Enough and Maybe it Will Become True
Dissing the IPCC and Other Scientific Organizations - How Climate Deniers Work
How the Media are Used to Intentionally Mislead the Public on Global Warming
There are more exposing climate denial posts on The Dake Page, so feel free to root around a bit. I'll add to the above list as new articles surface, so bookmark it and come back periodically to find out new tactics climate deniers use to lie about the science.