Is Global Warming a farce?
No, Global Warming is not a farce. See the question above.
The strict definition of a farce is "a comic dramatic work using buffoonery, horseplay, crude characterization and ludicrously improbable situations".
There is no way this can be applied to global warming. The 2015 agreement in Paris was a very serious undertaking where all 187 countries of the world made decisions to cut their carbon emissions so as to limit future warming to no more than 2 degrees Celsius.
If you are asking "Is Global Warming a Fraud?" then that question is here.