The rest is a mixture of pseudo-science and politics.
Fact is that nobody knows why the Earth is getting hotter.
No, the study of the Earth's climate is hardly a pseudo-science. It is a hard science based on observation, computational models, making hypothesis and testing them. There have been satellites collecting observations for decades, surface measurements for over a hundred years, and ice core samples going back thousands of years. We can directly observe the output of the sun on the surface as well as in space, the concentration of various gasses in the atmosphere, etc.
How in the world is that a pseudo-science?
There's politics involved because it would be expensive to try to take corrective action. The change would need to be done on a massive scale, which is going to necessarily require the involvement of governments. The ozone hole would have never been closed if not for the governments of the world agreeing to stop producing CFCs.
What amazes me is that people think we can't affect the climate when we just recently formed large holes in the ozone later, passed policies to stop it, and those policies worked and mitigated the ozone hole at the poles. Clearly, the actions of humans can have global impacts.
The next argument is that the climate is always changing. While that's true on a geologic timescale, it isn't for a human timescale. We have never seen such a sharp increase in the concentration of CO2 gas in the atmosphere, even going as far back as ice core samples allow. What non-human reason could possibly be behind such a sharp increase that has never before occurred? In addition, we have good estimates of how much CO2 is released into the atmosphere every year and this amount is sufficient to account for the increased levels of CO2.