“ Thus, for example, we see that a clean environment, wealth or democracy mean little in the face of war, especially nuclear war, and that material development is not sufficient to ensure human happiness. ”
 14th Dalai Lama, Nobel Lecture (1989). copy citation

add

“Peace can only last where human rights are respected, where the people are fed, and where individuals and nations are free. True peace with oneself and with the world around us can only be achieved through the development of mental peace. The other phenomena mentioned above are similarly interrelated. Thus, for example, we see that a clean environment, wealth or democracy mean little in the face of war, especially nuclear war, and that material development is not sufficient to ensure human happiness. Material progress is of course important for human advancement. In Tibet, we paid much too little attention to technological and economic development, and today we realise that this was a mistake. At the same time, material development without spiritual development can also cause serious problems, In some countries too much attention is paid to external things and very little importance is given to inner development.” source