What do you understand by population explosion? What are the dangerous results of population explosion?

What do you understand by population explosion? What are the dangerous results of population explosion? (GS 1)

आप जनसंख्या विस्फोट से क्या समझते हैं? जनसंख्या विस्फोट के खतरनाक परिणाम क्या हैं?