If you don’t know about or understand the evidence that shows incontrovertibly that we are warming the planet, you are IGNORANT. No sin here. You can rectify your ignorance by hard study.
If you refuse to put in the hard study, then you are WILFULLY IGNORANT and your opinion is worthless.
If you refuse even to look at the evidence even when it is shoved in front of your face and still insist you understand better than all the experts, then you are a DENIALIST.