Questions & Mysteries One Piece is actually a metaphor for Climate Change

[Peenix]

After Imu destroyed Lulusia, sea levels started to rise and cause various islands to be submerged

This is a metaphor for the billionare class destroying the environment and causing the global poor to deal with the consequences

 

[Sasaki Kojirō]

It makes sense. That's why the government was afraid of Kaidou and his enormous flame dragon, which could essentially do the same as an ancient weapon. Kaidou was still ambitious; he was even aiming for the ancient weapons. Just imagine the most powerful being in the world with the ancient weapons on his side. It would truly be the end of the world.