Answer to Question 1
Compassion for those less well off, and concern for justice, honesty, sufficiency, humility, and neighborliness are stewardship virtues. Each of these virtues relies on people thinking of others before themselves. By reducing our selfish tendencies and focusing on others and their needs, we will automatically act in more sustainable ways.
Answer to Question 2
It is a network of the world's large city governments. C40 is committed to addressing climate change.