we can start with:
Conspiracy to defraud is an agreement between two or more people to act dishonestly to deprive someone of property, cause them financial loss, or expose them to economic risk. It is a criminal offense, and the conspirators can be prosecuted even if the actual fraud is never executed or no loss occurs.
but i'm also ok with creating a separate crime against the environment and applying it retroactively to top management and politicians whose work and decisions have inflicted most damage.
> evidence for such conspiracy existing
that is exactly what should be investigated.
> should be "investigated" and "executed"
obviously executed when found guilty (i could be convinced that other forms of punishment are sufficient). why are you inventing things to get outraged about?