What about it?
>Who say this to you? It was God, animals themselves or some voice of Universe?
This is what I learned by studying biology and ecology
>There is no one here, only us. We can do what we think is right.
You're suggesting interrupting a natural ecosystem that is beyond complex, likely leading to its complete collapse, due to lack of understanding.
You may "think" you're right, but anthropogenic projection and a complete lack of understanding of how the world works doesn't make your view right, if anything your an example of someone with good intentions that would utterly fuck up the world if you were given control
>If we see suffering that has no any purpose, we can stop it. What is "purpose" is just our choice too.
Suffering is a natural state of existence, we all experience it, it's part of life, many philosophers would argue a necessary part of life.
>For what? Now we are life on the planet. Nature has evolved and we are the result and next step.
We rely on a massively complex ecosystem made up of millions of other living organisms. We are not "the life", we are an example of it on this plane.
Nature is continuing to evolve, we're just one point on a long line of changes.
>Now we have a new ecology: mankind and Earth.
That is absurd and unjustifiable. Earth's ecosystem is made up of billions and billions of living things, humans are just one part of it, and one of the most damaging, destructive, short-sighted living things and we cause significantly more suffering than anything else.
I would suggest starting with biology and ecology courses, and some history both geological and human.