Well Rojash, you're not alone in not having come across reasoned arguments against global warming. The main reason appears to be that nearly all of the media are too scared to report on them. (As a single example, the world's most reputable scientific journals have been threatened with boycotts by pro-warming academics).
The Australian parliament recently threw out a carbon pollution reduction bill, despite frantic attempts by the climate change minister, Penny Wong, to have it passed. Before the vote, a senator (Fielding) called in scientists to examine the data presented by Wong, and they basically tore apart her arguments. Where or when did you see or hear any form of report on those scientists' findings in the UK media?
If you're so inclined, there's a long and detailed paper on it here...
http://jennifermaroha...%20on%20Wong-Z%20.pdf