Well, if you don't accept the temperature record, that's fine. Most people, even among skeptics, accept the instrumental temperature record showing a global rise in temperature of about 0.74 deg C. If you don't accept the temperature record, then your logical response with respect to global warming, should be "I don't know" since that should be your conclusion when lacking any data.
Global Warming Is Caused By Mann-Made Data Tampering
Posted on January 8, 2014 by stevengoddard
The image below extends the 1975 National Academy of Sciences Northern Hemisphere temperature graph, with RSS Northern Hemisphere satellite temperatures. There are warming and cooling cycles, but no warming trend.

NASA and NOAA creates the imaginary trend, by massively cooling temperatures between 1890 and 1960 (green line below.)