Try some of the pro-environment activities at: Atmosphere, Climate & Environment Information Programme

"Earn money pooping":

SMART OFFICIALS IN India are paying people to go to the toilet. The cash-for-deposits scheme in Tamil Nadu creates a useful supply of fresh fertilizer while gently training residents to stop pooping in unsuitable places, ie, your neighbor’s patio, the queue at McDonald’s, the hospital lobby, etc.  But don’t quit your job and fly to India yet. The pay is the equivalent of 12 US cents (HK$1) a month, a salary which is on the low side. “Even by YOUR standards,” I said to a teacher friend of mine who is always complaining about his income.

A Taiwanese guy said his country went to an extreme. At a chain of restaurants called Modern Toilet, diners sit at full-size toilets and eat out of smaller ones (pic above). They wipe their mouths with toilet paper hanging over the table. But you don't have to go to Taiwan to 'taste' these culinary delights. Take Exit F from the Causeway Bay MTR and then walk into the Watsons Superstore that is in front of you and go up to the 4/F where you'll find a toilet themed restaurant."