Reward system

I have had a new idea to add to my project that I feel could work really well. I found that there is no incentive for people who are not too bothered about maintaing a greener lifestyle, so I have come up with idea of having a reward scheme, where by each time the person does something good for the environment that get rewarded.

The way in which I intend to create the reward system is similar to the way the nectar card runs. The nectar card works by swiping a card each time you purchase a product at a certain place, you then get points that add onto your nectar account, the more expensive the item, the more points are rewarded.