You might benefit from climate change if you live in high latitudes and you can now swim in the ocean without your penis disappearing thanks to warmer weather. But what if you already live in a place that reaches 50 degrees celcius during summer?
On the topic of volcanoes, large eruptions have in the past, temporarily cooled the planet and have been responsible for famines, not because of co2, but all of the particles that prevent the sun from warming.
No one has mentioned ice core samples, which are essentially a journal of atmospheric gases for the last million years.
By the way, I'll give my post a thumbs down, just to get things moving.