Some elements of directional flow listed here may be more important than others and all elements may not warrant an equal focus. Care should be taken to ensure this flow is not double counted in estimates of multilateral climate finance flows. The Rio Markers do not allow exact quantification of amounts allocated within projects specifically to address climate concerns but instead provide an indication of the extent to which donors address the objectives of the Rio Conventions in their aid programmes. There is thus significant room for interpretation and also opportunity for error.53 A marker for adaptation has been included only in 2009; while the initial Rio markers did not explicitly exclude adaptation projects, rendering the distinction between adaptation and mitigation for the past years could only be attempted by review of individual project details and even then may not be possible.