Once the appropriate cost estimates have been established, governments would then need to internalise the value of such resources into the full costs of the economic activities that deplete them. Quite obviously, issues such as climate change or tropical rainforests, which constitute a vital link in the global oxygen cycle, transcend national boundaries and need to be internalised through cumbersome, but indispensable, international negotiations. A well-known study on the full costs of energy prepared for the European Commission by Ecofys consultants (2014) is a case in point. The study included in its calculations the social costs for non-internalised resource depletion at a level ranging between EUR 9 and EUR 14 for gas, coal, oil and nuclear per MWh produced (Ecofys, 2014: p. 37) - see Figure 7.3. Nuclear power fared actually rather well in this comparison, given its good performance in terms of climate change risks and air quality (particulate matter formation). Not only have proved reserves for all four resources been rising rather than decreasing.