I am not a scientist, only a layperson with an interest in the sciences. If I'm totally off base, someone with a scientific background is welcome to correct me, but this is my understanding of why a matter of "provide me a link and some proof and I'll totally believe you!" is not... really as black and white as people make it out to be re: climate change.
Climate change as a result of human action is a fact. Obviously (I should hope.)
The problem is that, as with many, MANY perfectly fine and correct findings derived through rigorous scientific methods, it takes a mountain and a half of studies, some good, some great, some flawed, all overlapping and building off each other, correcting and correlating and criticizing each other to make up the more complete picture (climate change/global warming) that we see now. There are many experiments you can conduct in a lab, and then duplicate in further studies, controlling for as many factors as possible. With climate change and the impact thereof, the earth is our laboratory, and the factors are infinite and impossible. You can't test for "every fact of human interference in the environment"-- where would you even start? Fossil fuels? Ozone? Coal? The drainage of lakes, building of dams, rerouting of major water sources? Overfishing? Giant cow populations? Pollution in the air and sea resulting in major impact to algae blooms? How does what happen in China impact the US, and vice versa? No one study, experiment, or research can cover them all, we can only look at a thousand million studies and draw our conclusions from those. But that, of course, is a complex answer that isn't easily swallowed by folks who just want something black and white and fitting to their personal political views.
And of course, for every bit of research stating one thing, people can point to another bit of research stating another-- even if it's been disproven, outdated, or is found to be untrue. That's the beauty of science, that it's ever growing and ever self correcting, but also the pain of it, as down the line, you can find a study that proves any old bullshit you want to prove, and people will cling to that if it matches their belief. Much like anti-vaxxers clinging to the one disproven, totally bullshit "research" linking vaccines to autism and claiming that it's science, really, you're going to have climate change deniers doing much the same.