We live within the environment. So that directly relates with our survival, our life. So through that way, more concern of well being of humanity, then naturally concerned about environment.
Material objects give rise to physical happiness, while spiritual development gives rise to mental happiness. Since we experience both physical and mental happiness, we need both material and spiritual development. This is why, for our own good and that of society we need to balance material progress with inner development.
The nature of the mind is such that if certain mental qualities are developed on a sound basis, they not only remain, but they also increase. In fact, once properly developed, the mind's good qualities eventually increase indefinitely. Therefore spiritual practice brings us long-term happiness and inner strength.
The very purpose of religion is to control yourself, not to criticize others. Rather, we must criticize ourselves. How much am I doing about my anger? About my attachment, about my hatred, about my pride, my jealousy? These are the things which we must check in daily life.
Most REAL change is slow. Happiness and joy are the purpose of life. If we know that the future will be very dark or painful, then we lose our determination to live. Therefore, life is something based on hope.