Living in the US, where the carbon market is artificial, there is the option of forming groups which can then fund the development or application of clean technologies in countries such as india. If you think about the fact the country has almost year round sunshine, a very large population and severe power crunch, funding (indirectly buying carbon credits) use of photovolataic systems in housing developments, recycling waste water, etc, would do a bunch of good for your consciounces. Additionally, it would do real good.