I've not seen a presentation of the data that actually proves global warming:
1. Is caused by humans (or at least primarily by human activity)
2. Is a trend that will continue unless we intervene
3. Will, on the whole, be bad for us, so we have to do something about it.
You could say that, based on the evidence, you believe all of those things, but not a single one of the three has been incontrovertibly proven. You could say that you believe it would be prudent to begin behaving as though those three items were true and adjust your lifestyle accordingly, but that's not exactly what we're being told. The popularizers of global warming alarmism go far beyond what scientists can reasonably say while remaining true to the standards of their profession.