it's not a matter of belief. that's not how science works. the big bang theory arose because it's currently the only working theory that fits all the evidence. scientists dont gather once a year to "vote" if they believe in big bang theory, anthropogenic global warming ,etc. that's now how "consensus" happens.
scientists in a given field perform experiments, gather data, and analyze it. they publish their findings in peer reviewed papers. when 97% of all such papers (backed by evidence, math, and their worked is checked over) point towards man-made global warming, that becomes a working theory. and the people writing these papers are experts in those particular fields: geologists, atmospheric physicists, oceanographers, glaciologists, etc.
so if a guy like ben carson, an accomplished neurosurgeon, starts giving his opinion on climate change, it's not really considered. similarly, i wouldnt ask stephen hawking to perform surgery if i needed it.
people who study climate largely come to one conclusion, and it's not just a bunch of american scientists bought off by their universities, it's a global thing. even climate scientists in in china, where their government doesn't give a single about environmentalism, have the same scientific conclusions. unless a scientist is employed by a company (like anybody in the heartland ins ute), there's no reason to doubt their credibility
i know it's hard, but to really take and understand scientific concepts, you HAVE to separate the science from the politics/policies. for decades, scientists were telling us that cigarettes were linked to cancer, and people like yourself doubted them because they figured scientists were biased and basically politicians who wanted to put regulations on cigarettes. how'd that one turn out?