In the opinion of a number of scientists, human - induced changes in earth’s atmosphere and oceans have made our planet a dangerous place by contributing to more frequent and more severe natural disasters. And the future looks uncertain.
लेकिन अगर उसका रख - रखाव सही तरीके से न किया जाए या गलत इस्तेमाल किया जाए तो वह खतरनाक साबित हो सकती है ।