As people alive today, we must consider future generations: a clean environment is a human right like any other. It is therefore part of our responsibility toward others to ensure that the world we pass on is as healthy, if not healthier, than we found it.
Without religion, also there is a way, it could be this way, through education, through scientific findings, then you get conviction. Not necessarily really love other, but for their own interest they are showing love, compassion to other like that.
In harmony with the Tao, the sky is clear and spacious, the earth is solid and full, all creature flourish together, content with the way they are, endlessly repeating themselves, endlessly renewed. When man interferes with the Tao, the sky becomes filthy, the earth becomes depleted, the equilibrium crumbles, creatures become extinct. The Master views the parts with compassion, because he understands the whole. His constant practice is humility. He doesn't glitter like a jewel but lets himself be shaped by the Tao, as rugged and common as stone.
When the only bond between close friends is attachment, then even a minor issue may cause one's projections to change. As soon as our projections change, the attachment disappears, because that attachment was based solely on projection and expectation. It is possible to have compassion without attachment, and similarly, to have anger without hatred.
Certain beliefs must accompany every action: One should act without selfishness, cultivate compassion for all living things, and develop respect for others.
Having abandoned the taking of life, refraining from killing, we dwell without violence, with the knife laid down, scrupulous, full of mercy, trembling with compassion for all sentient beings.