All the scientists of the world organized the production of the reports together since 1990, supported by almost all governments of the world, including those who would otherwise benefit from bigger fossil fuel use. The conclusion is: human-made climate change, and if nothing is done, the effects are dire.
Note: there was no scientific valid input that would disprove the human-caused climate change, and believe me, different countries would push hard had they been.
The first report was produced 1990, the fifth, updated 2014, here it is the full "synthesis" part of the report, PDF, 14 MB:
http://ipcc.ch/pdf/assessment-report/ar5/syr/SYR_AR5_FINAL_f...
A little longer explanation then mine in Wikipedia:
https://en.wikipedia.org/wiki/Intergovernmental_Panel_on_Cli...
Additionally, it is proved, by looking at the yearly reports, year after year, that Exxon finances the "deniers." Just to give you the idea how you can possibly doubt: when there's a TV show to be made, there's one real scientist, to represent all the scientists of the world, and on another side a paid pre-selected person to pose as the "alternative view."
So the public sees "oh, it's 50:50." It's not, it's rather more like 99.9:0.1. You can always find some extremists, even among the scientists. But even those found "denying" are typically from some other branch of science, effectively out of their range of expertise.
The another reason for what appears to be 50:50 is that the politicians of a whole big US party, almost without the exception, identify themselves with the financiers and "dance the denial."
The big interested financiers can't disprove it, but they can produce enough confusion to prevent some political decisions to occur, and that is good enough for them. Relatively little money (for them) gives them a lot. That the whole planet is affected, they don't care.
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Edit: answer to your "ocean temperatures":
Now, it's really measured. For the past, a lot of work:
http://serc.carleton.edu/microbelife/topics/proxies/paleocli...