They're very wrong. They are paid large sums of money to come to these "conclusions". Modern day science is just like everything else......all about the money.
Who is going to pay large sums of money in favor of climate change? There's very little money to be made promoting climate change. You think green energy companies are paying off 95% of scientists when they are just getting off the ground?
If you are jumping immediately to baseless conspiracy theories, wouldn't it make infinitely more sense that Oil/Gas/Coal, big companies with massive reserves of cash, lobbyist firms, and footholds in society, would be influencing science to bury climate change?
Finally, how are you going to pay experts large sums of money? Experts are not a collective. They are different people in different scientific fields with different funding sources coming from different countries. It's often very hard to get these people to agree on anything. The barrier to acceptance via peer review is precisely why science works as well as it does. And these experts would be risking their status in the scientific community if anyone found out they'd been bought
Contrawise, all it takes to convince people online that the science behind this isn't real is a bit of propaganda. It's infinitely easier