मानव समाज पर जलवायु परिवर्तन के वैश्विक प्रभाव को सबसे सटीक रूप से किस प्रकार वर्णित किया जा सकता है?

Prolonged exposure to extreme cold temperatures may result in tissue damage known as frostbite, which is categorized as a:

In the context of ecosystem energy dynamics, which of the following expressions correctly defines Net Primary Productivity (NPP)?