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This rant of John Oliver's on HBO's Last Week Tonight is a good example of the scientific process and how it is superior to simple opinion. If you decide not to watch this video because of my description of it, then you have a opinion, which is not science.
This graph was prepared by NASA in 2011 (full article)showing the overall global surface temperatures since the 1880's. Back in the 1880's and early 1900's, there is some uncertainty, but it is undeniable what has been happening since the middle of the 20th century. Take a look. If you believe that this is a conspiracy to promote some political view, then answer the question: What political view and how will it benefit the politicians?