I think we need to move away from a human-centric view of the world towards a deep ecology view, that is what has got our species into so much trouble. Social and environmental justice are part and parcel of the same thing. If you care for the environment, you are also caring for its inhabitants, which include people. And animals are people, in my book. They are sentient, they feel compassion and love, they have distinct personalities. Yet another reason why I am a Pagan.
I know some people who only give to charities that help people in the UK, because they seem unable to see that we are all part of the same world, and that if people in other countries are suffering, then it will eventually have an impact on us - indeed, already is, what with the number of asylum seekers (who are very welcome as far as I am concerned).
Other species' suffering, because it impacts the ecosystem, will eventually have an impact on humans anyway. Not that I think giving to animal and environment charities needs justifying on the grounds of the effect on humans, any more than I think giving to non-UK-helping charities needs justifying on the grounds of how it will help people in the UK.
My regular charitable giving goes to Survival International, RSPCA, Friends of the Earth, Oxfam, Stonewall, and Sight Savers. I also buy the Big Issue and shop in charity shops. I used to give to Greenpeace but recently I have become concerned about their campaigning methods.
I need to do a charity audit and decide which charities I will donate to, and why. I think I need to increase my giving to animal and environmental ones.