It's a simple question: if you can't answer it in a few words w/out looking it up, you probably don't know enough about AGW to be able to sort good information from bad. I asked you first anyhow. 

I did, in fact attempt to answer Silverhorn's question, which is a valid one, but couched in generic terms that could apply to any scientific or industrial endeavour.  In terms of AGW it WAS addressed, however, and definitively, by Richard Muller back in about 2012 in a series of high profile articles in Geophysical Research Letters that confirmed the validity of the global temperature data. Muller was formerly a leading skeptic: here's his mea culpa in the NYT.  

http://www.nytimes.com/2012/07/30/opinion/the-conversion-of-a-climate-change-skeptic.html

The GRL articles are source-protected, it appears, but here's another article about Muller's findings, from The Guardian.

https://www.theguardian.com/environment/2011/oct/20/global-warming-study-climate-sceptics