this wasn't my exact complaint, but it's similar; the graph starts at 320 and goes up to 420, meaning the slope is intentionally exaggerated. if you want to show us how much worse things have become, give us comparison to earlier CO2 levels, otherwise this just gets dismissed as alarmist propaganda.
The slope isn't exaggerated - it shows a linear trend, and it choses the only reasonable limits in order to illustrate this in the period. Starting the graph at zero would make no sense - you could easily illustrate the stability of global temperature by showing a graph of average temperatures starting at zero Kelvin.
What is true is that atmospheric CO2 is hard for most of us to interpret substantially. However, the graph is not setting out to effectively illustrate how much CO2 there is in the atmosphere, but rather the linear growth of atmospheric CO2 levels in spite of various efforts.
If the Y axis was secretly log transformed or something like that, there would be reason to worry. But it's linear, and the story told by the graph is accurate.
The instinct of checking the limits of the Y axis is a good one though.
The slope isn't exaggerated at all, the increments are same as if you showed the full graph from zero. But zero isn't a useful baseline, and zooming out to fit it into your screen would give a false impression of a flat change at the top of a narrow section of history. What would fix that is a longer x-axis showing further back in time. Then you'd see a relatively flat line with some rises and dips, then at the end a sudden spike.
My work computer has that thing in the taskbar telling you about news and the weather. I swear it tells me about a record high temperature for this day several times a week.
Here's a chart at the beginning of the global average surface temps, so you can compare from 1960 and see a similar trend. Lower down you can also find the IPCC projected paths and see the same. RCP8.5 was considered no action and business as usual...more or less where we still are.
I think people care, we're just trained into patterns of learned helplessness and isolation over generations.
There were large swathes of people who resisted during the 19th and 20th centuries, they were systematically murdered en masse. I bet it has happened many times over the centuries.
Sometimes I wonder if we've bred ourselves into either loyal obedience or dispassionate compliance because everyone else was always killed by the first group while being ignored by the second.
I read in a book written in the 90s that said in 60's the US DoD commissioned a study of threats to America, and the single biggest one was global warming. Not Russians, or Chinese, nope it was this. They knew then.
People are dumber with higher CO2 concentrations. No joke bring a brilliant person and they will struggle. This is why we need good ventilation in classrooms because it can get stuffy(low O2 and high CO2)
There is a certain atmospheric concentration of CO2 that accompanied giant dragonflies and shit. Maybe if we bring those back people will take things more seriously.