From a systems perspective, the reason to stabilize our climate as soon as possible is to avoid the reinforcing biogeochemical feedback loops that could drive catastrophic, runaway climate change.
We made our own causal loop diagram of many of the most important feedback loops. You can see it below.
(Notice the big “balancing loop” to the far left. THAT’S YOU and ME!!)
To learn more about them (not fun, but important…), check out this excellent animation: Wake Up, Freak Out – then Get a Grip from Leo Murray on Vimeo.