Since Nepal is one of the signatory nations of Kyoto Protocol, of course there is carbon credit system in Nepal too although it may not be as developed as here in US, I believe.  Non-profit organization like Winrock International Nepal,  WWF Nepal, and Ministry of Environment, Science and Technology (MoEST) along with ADB work together to deal with climate change and carbon credit in Nepal at the policy level.  But I am not quite sure how it works at the grassroot level.  There are many projects in Nepal that have been doing some work in abatement of greenhouse gases under the technical and financial support from those mother organizations.