Environment & Ecology · Environment
1992 के पृथ्वी शिखर सम्मेलन (Earth Summit) के दौरान सतत विकास के उद्देश्य से अपनाए गए घोषणापत्र 'एजेंडा 21' में संख्या '21' का क्या अर्थ है?
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