Climate change is in no way anywhere near an exact a science as the movement of celestial bodies. Just throwing the term "science" out there to act like they are the same is ridiculous. Humans have been predicting the movements of constellations and planets in the sky for thousands of years. You can't tell me if driving an SUV, overactive volcanoes, or solar activity is really the cause of warming. You can't tell me what the temperature of the ocean was 1000 years ago, but you could predict the position of the stars 1000 years ago without much effort. Climate change is the worst kind of science. It is political and funding comes from political sources.
This is true. The two areas of study do not overlap, and one hasn't been around very long in comparison to the other. All you really need is a decent telescope, an understanding of geometry and algebra, and a few sheets of paper to figure out the movements of moons and planets within a decent margin of error.
That being said. Once upon a time, we used to call climate change something else: Pollution.
At first, people ignored the small group of scientists that started to voice concerns over what was happening. Then more scientists came to the same conclusion, and finally, people realized we were making ourselves sick with what we were putting in the air. We were clogging our lungs with soot and poising our bodies with the toxins. Lifespans went down, developmental issues skyrocketed, and people started to realize something was wrong. The US and other countries did a decent job reacting to the issues because they were affecting our daily lives.
I've worked in places where the locals don't understand what a carcinogen is, and they won't bother listening to you if you try to explain it. They will burn things like old car batteries to keep warm because that's one more hour their family doesn't freeze to death. Some days the air got so bad it would sting the back of your throat, and all you could do was put a dust mask on and hope for the best. Every year that goes by I wonder when I'll get a cough that doesn't go away and end up looking at the worried face of my doctor after getting the results of an x-ray.
So yes, I can't "prove" driving an SUV is causing global warming at a greater rate than other natural causes; much like it would be difficult for you to disprove it. However, as we grow to understand the things around us, we learn that we are not as in control as we once thought. Sadly, it's usually after we've witnessed the damage that we realize what was happening. We've damaged our own bodies in the past from pollution, why is it so hard to believe we may have started to damage the earth itself?