If you could change one global problem (climate change, poverty, education, etc.), which would you choose and why?

First of all, I think it is important to consider about climate change.
Because of climate issue = issues, Korea is no longer a liable climate country.
These days, Today = today is a breeze, but tomorrow will be a hot.
The empty = emptiness of water is at a serious level.
We should be interested in climate change.