The slope of temperatures does not appear related to CO2 concentration in Vostok data - Latest News (hidethedecline)

It appears that there is no visible connection between CO2 concentration and the slope of temperatures in these Vostok data. In fact, if I insert a trend line it appears slightly negative.

Again, these are the data that should show the warming effect of CO2. Im not sure how much I can conclude on this, but i believe the CO2 - warming message would stand stronger if one could see bigger warming trends for bigger CO2 concentrations.