This was summed up well some 25 years ago by authors Barbara Ward and René Dubos in their book Only One Earth: “The three broad areas of pollution which we must examine — air, water, and soil — make up, of course, the three main constituent elements of our planetary life. ”
और यही हमारे ग्रह पर जीवन के तीन बुनियादी तत्त्व हैं । ”