What we have to do to protect animals becoming extinct? what can we do to stop killing homeless dogs and cats? what do

It is very important issue to protect animals becoming extinct. Animals are our friends and we have to take care of them. First of all we should protect our nature, we should stop pollution of the Earth, we should learn how to recycle the garbаge. In order to stop killing homeless dogs and cats we should make special animal shelters. I think that every person have to deside to eat or not to eat meet in his life.