The need to protect environment and control of corruption are the issues important enough for states to call a constitutional convention.
Step-by-step explanation:
Climate change is the concern of the whole world which needs to be address as very critically. The government needs to frame news and strict laws to which can be useful in the protection of environment as saving environment means saving the future.
On the other hand, leading level of corruption is also an important issue for government needs to calls for constitution convention.