From Sonic flyer

Answer these questions:

- why is the climate changing on Mars?
Mars is warming because of a change in albedo or a change in the reflectivity of the surface. You also can't compare a planet with 1% the Earth's atmospheric volume to Earth.
https://www.nasa.gov/centers/ames/research/2007/marswarming.html


- why did the climate change on Earth millions of years before the Industrial Revolution?

Climate does change through small changes in the Earth's orbit. These are actually accounted for and shown by the same scientists you are saying don't know what they are talking about. The difference you need to look at is the warming trend over the past 100 years vs the most aggressive warming trend on the Earth before the industrial revolution
https://climate.nasa.gov/evidence/

- does the sun maintain a constant intensity/output? The sun's activity is on an approximate 11 year cycle. Much to short of a time period to effect climate

- is the orbit of the Earth around the sun a constant distance, or does it ever change? Already spoken to above


When you think about the answers to those questions then get back to us