A finger alone cannot do what a hand can do. A single person cannot do what a team can do in any sport. On the same lines indeed it is unrealistic to expect individual nations to make, independently, the sacrifices necessary to conserve energy.
Having said that it is the one who starts the revolution and others follow the league. But we can't wait for someone to initate, Especially when things are just waiting to get worse. An International leadership where all the leaders come to decision considering all the road blocks, individual perspective, social and economic development is required.
Now it is of atmost importance that we have a worldwide co-operation because it might happen that to achieve this goal a set of rules may hinder the development for a few nations, or may directly affect the population, or may bring down already established nations. So a worldwide consent is must for its success.
Lets take a real life situation here. When all the countries to cap on carbon emission coined the concept of carbon credits, the best example of international leadership. To bring down the carbon emmision or green house gases it was decided to fix a certain level of carbon emmision based on the economic health of a nation and if a country exceeds the level it will have to pay or it will have to buy carbon credits from other nation. As of now it has been successfully implemented and is progressively helping bringing down green house gas emission.
With one nation in the role it would not have been possible. But together our leadership made it and sure we can in future for any cause.Their are certain issues which cannot be handled individually by a nation (i.e. funds for natural calamity kept by UN, funds for economic meltdown, poverty, social services, fighting terrorism). we need all hands to meet because these are not single handed jobs. Conserving Energy is one of them.
Something which our future generation will look up to and be grateful of us. Together we can!! United we stand, divided we fall.