Well, that's one way to look at it. Writing in Haaretz, Orna Coussin praised Yom Kippur (the Jewish Day of Atonement that began Sunday night and ended Monday night) as the ultimate green holiday. Coussin is a secular Israeli and was expressing her appreciation for the fact that everyone is obliged to travel by foot on Yom Kippur. All traffic stops in Israel. No cars, busses, trains, or taxis clog the streets on that day. The shops and offices are closed and the city is given over to pedestrians. "Last year, on Yom Kippur," she exults, "carbon monoxide levels fell from 205 parts per billion, on the day prior to the holiday, to just 2 parts per billion at its height -- a phenomenon unmatched anywhere in the world."
That's nice. But for millions of Jews worldwide the Day of Atonement continues to exert its traditional power. Coussin may see it as a day for walking the city; religious Jews are trying to walk with God. But even non-religious Jews can find uplift in the Yom Kippur service.
Fierce secularists like Christopher Hitchens deny that religion is necessary for morality. In any particular case, this is impossible to deny. Many highly moral people are non-religious (though, I would venture, less often anti-religious). But people being the way they are -- rationalizing, lazy, self-satisfied, absent-minded, and evasive (to list only some of our milder shortcomings) -- the religious tradition, with its weekly (or in some cases only yearly) kicks in the backside, prods us toward virtue, or perhaps even righteousness.
Yom Kippur is a day of fasting and repentance. This is well known. But the fast -- though severe (it lasts 25 hours and requires abstention from food and water) -- is not the substance of repentance, only a symbol. The whole High Holiday season, which begins with Rosh Hashana, is a period of prayer, self-examination, and repentance. This is a time to give generously to charity -- both for its own sake (the Hebrew word for charity is "justice") and to demonstrate our sincere repentance. We are encouraged to pay our debts during this time, and to ask forgiveness from those we have wronged. If we are rebuffed, we're expected to ask again ... twice. Offenses against our fellow human beings are not forgiven on Yom Kippur unless the wronged party has extended forgiveness. As for offenses against God, worshippers are reminded that God is not interested in fasting alone, only in genuine repentance. The measure of sincerity is altered behavior.