Well... I happen to be a professional scientist with some 35 years working experience. Anyone interested in the evidence as it stands at present could do worse that look at the

Global Environment Outlook 4 (GEO - 4) Report

This link is for the English language version, other language versions are available. (Warning... some 570 pages!). All the sections give an extensive list of references. The Report does not make for very happy reading.

While the Report is about much more than climate change, the section dealing with the atmosphere does say

Climate change is a major globalchallenge. Impacts are already evident, and changes in water availability, food security and sea-level rise are projected to dramatically affect many millions of people. Anthropogenic greenhouse gas (GHG) emissions (principally CO2) are the main drivers of change. There is now visible and unequivocal evidence of climate change impacts. There is confirmation that the Earth's average temperature has increased by
approximately 0.74°C over the past century.

The very last sentence of the report concludes

...the scenarios point to the need to act quickly. Our common future depends on our actions today, not tomorrow or some time in the future.

RS