"Slaughter billions of animals unnecessarily" ----EXACTLY.
56 BILLION farmed animals are murdered each year.
If humans killed each other at the rate that they murder animals, all the humans would be gone in 17 days.
it's been predicted that humans only have 12 years until the tipping point is past and the downfall of the human race is guaranteed.
The #1 thing you can do to stop climate change and save the environment is to adopt a plant-based diet.
If we do attract the attention of alien life forms it probably won't be the good kind as no advanced race would want to waste their time on us in our current state.