Yes, the UN should prioritize poverty over climate change, because poverty is a big problem today, while climate change is still largely in the future. FDR, American president, believed it was important to focus on the present, because for people who are starving there is no tomorrow. The United Nations should have the same priorities.
Poverty is a much more pressing problem then climate change. There are over 800 million people worldwide that don't have enough to eat and most of them live in developing countries. The UN should focus more on aiding those countries because that is where their efforts could do the most good.