Reducing animal agriculture for the benefits to humans by reducing habitat destruction is a really roundabout and ineffective way to help humans.
If you want to help humans, you should do whatever most helps humans.
If you want to protect someone from climate change, you should do whatever most effectively mitigates the effects of climate change.
If you want to help animals for the sake of helping animals, you should do that.
But you shouldn’t decide that helping animals is better than helping humans on the grounds that helping animals also indirectly helps humans.
Reducing animal agriculture for the benefits to humans by reducing habitat destruction is a really roundabout and ineffective way to help humans.
If you want to help humans, you should do whatever most helps humans.
If you want to protect someone from climate change, you should do whatever most effectively mitigates the effects of climate change.
If you want to help animals for the sake of helping animals, you should do that.
But you shouldn’t decide that helping animals is better than helping humans on the grounds that helping animals also indirectly helps humans.