In the face of changing environment in the 21st century, world citizens are aspiring for clean and pure hearts and a livable environment in which ourselves and future generations can enjoy living without fears. It is time for humanity to run against time to stop depleting natural resources and to restore balances. Only when world citizens fulfill our obligations to the world by living simple lives, giving back earth what we took from her and starting acting now from the bottom of our hearts will love and peace be realized.