CryptnoHey mister science man did you forget that the Earth is 4.5 billion years old? So your chart represents the equivalent of millisecond. Doesn't seem like very conclusive data to me. Nothing that is happening now is out of the ordinary. I am not climate change denier yet for you to throw this idea that it's man made and catastrophic is idiotic. First there is no conclusive evidence that demonstrates causation with co2 and temperature. Second the Earth is in a cool period, a ice age infact, and humans are a tropical creature, warming would do good for us, it would allow for parts of globe once thought to be too cold to grow in arable. Third just as one can easily throw out projections of the world being under water in 5 years you could also acknowledge how much more moist the atmosphere leading to, you guessed it, more arable.
Unfortunately, scientists cannot measure that far back, but 400,000 YEARS with a consistent pattern seems pretty conclusive to me. I'm not sure if you looked at the chart or not because you can clearly see that the pattern had been disrupted and is now out of the ordinary because of humans. Notice how it shot up after the Industrial Revolution, supporting the idea that the CO2 levels are clearly being influenced by humans. Quoting an article from the Scripps Institution of Oceanography, "The rise in CO2 is unambiguously caused by human activity, principally fossil-fuel burning." You can find that article here:
https://scripps.ucsd.edu/programs/keelingcurve/2018/09/19/is-the-current-rise-in-co2-definitely-caused-by-human-activities/. If you do a simple Google search you can find thousands upon thousands of sources advocating for how humans are contributing to the rise in CO2, and that in turn causes higher temperatures. Humans putting more greenhouse gases into the atmosphere enhances the greenhouse effect, contributing to the warming of the earth (
http://www.environment.gov.au/climate-change/climate-science-data/climate-science/greenhouse-effect).
I'm not sure where you got the idea that climate change would actually do us good, but that's the opposite of the truth. With climate change the weather is going to go to the extremes. This means more intense heat waves (not good), rise of sea levels (also not good), more droughts, etc. Read more here:
https://climate.nasa.gov/effects/.
Addressing your third point, while some areas of the world may become more arable, this will cause the rest to be screwed. This could make it so there are droughts in the summer but wetter autumns, which would have a negative impact on the harvest system. Basically a short term gain is going to come at the cost of long term effects, which is not good. Read more at:
https://phys.org/news/2018-05-climate-arable.html.