Which idea did Zoroastrianism contribute to society?

1. Equality of gender, Men and women are equal in all manners within society.

2. Cleanliness of the environment. Nature is central to the practice of Zoroastrianism and many important Zoroastrian annual festivals are in celebration of nature: new year on the first day of spring, the water festival in summer, the autumn festival at the end of the season, and the mid-winter fire festival.