Climate engineering technologies can be viewed as substitutes as traditional abatement measures and includes 2 categories: solar radiation management and carbon dioxide removal. These engineering technologies vary with abatement measures in spatial effects, time effects, costs, and uncertainties & risks characteristics. Climate engineering measures change the previous international climate regime and create some new governance issues, such as new "free driving" versus previous "free riding" issue, new regional and intergenerational equalities issues. The research on climate engineering has significant scientific, policy and diplomatic implications.