Life is indivisible - that's why you can't separate human rights, animal rights or practical ecology from each other.
In fact, an effort to alleviate human suffering is motivated by the same reasons and internal motives as an effort to reduce the suffering of animals and nature.
As a world-renowned animal rights activist said, “The practical choice that thoughtful people face is not either helping people or helping animals. For, everyone can do both. People do not need to eat animals in order to help homeless, nor they need to wear animal skin in order to help abandoned children.”
In addition, the transition of a substantial part of the human population towards vegetable food will certainly very fundamentally help to eliminate the world's human hunger or the ecological burden of nature. Everything is related to everything!