Do you think that the costs of the REDD (Reducing Emissions from Deforestation and Degradation) program ($20-30 billion per year) will yield sufficient results to make the program worth its expense?

Do you think that the costs of the REDD (Reducing Emissions from Deforestation and Degradation) program ($20-30 billion per year) will yield sufficient results to make the program worth its expense? As the largest contributors to global CO2 emissions, do you think that developed countries have a responsibility to pay for such programs in developing countries? Why, or why not?