And how exactly would reducing hunger in Bangladesh prevent the country from being flooded as a result of rising sea levels?

What's meant by "mitigation" is this, btw:
Mitigation of global warming involves taking actions aimed at reducing the extent of global warming. This is in contrast to adaptation to global warming which involves taking action to minimize the effects of global warming. Scientific consensus on global warming, together with the precautionary principle and the fear of non-linear climate transitions[1] is leading to increased effort to develop new technologies and sciences and carefully manage others in an attempt to mitigate global warming.
Mitigation of global warming - Wikipedia, the free encyclopedia