You can only say that if you only look at the atmosphere and cherry pick the extremely hot year of 1998
No - you can say that if you simply observe ANY measure of temperature rise over the last two decades. CO2 has skyrocketed - temperature did not (it has gone up some but is now far below the most conservative estimates of warming, even though CO2 has risen as predicted). Thus, no correlation and certainly no indication a runaway effect is going to occur.
It's crazy that people are still treating a gas that the entire biosphere of the Earth was built to process as a danger, when there are real threats to the environment aplenty. Guess we'll all just ignore those while we go wackoid over nothing.