Because the Earth is surrounded by the atmosphere, air will push its way into any empty space, if it can find a way in.
काठमाडौं : जलवायु परिर्वतनका कारण विश्वभर नै मानवीय स्वास्थ्यका क्षेत्रमा चुनौति थपिँदै गएको छ ।