It's my understanding that while we can turn Earth into a pretty hazardous place that we do not have the total carbon required to re-create the exact venusian environment on Earth.
Your point still stands, however, regardless of exaggeration :(
Most of this past is incompatible with human civilization, as we know it.
For example, many scientists believe that the Permian extinction happened due to a rapid release of greenhouse gases, and rise in temperatures - by ~6C. 95% of the Earth's species were wiped out in a few years.
These kinds of events aren't trillions of dollars of damages. They are billions of human deaths, as ecosystems collapse, as the tropics and subtropics become uninhabitable.
Unfortunately for us, while CO2 may not cause such a drastic change in temperatures over the next few decades, methane release very well might.
