All indications are that we are 100% responsible, or very close. the best source of info is the climatologists at NOAA or others that are reputable/published at universities.
Yes, there are other non-anthropogenic factors that influence temps, but those are taken into account in climate models and we have a very solid understanding of what those are and where we are in the respective cycles.
The right-wing whack jobs conveniently ignore them because their analyses don't fit with their agenda.