As mentioned in other posts – the person is composed of the body and soul. Your essence is your soul. When you please it you feel good. What pleases the soul? Doing the Mitzvot. Mitzvot are commandments from the Torah.
One of the Commandments is “Bal Tashchit.” – Do Not Waste. It includes refraining from unnecessary destruction and wasteful consumption (Maimonides – Kings 6:8,10).
When you recycle you accomplish this Mitzvah. Thus you feel good.
Green is Good.